My Little Sister Is the Best F*p Material - Volume 2 Chapter 02: Health Class with Miyu-sensei

Volume 2 Chapter 02: Health Class with Teacher Miyu

I was sitting on the sofa in the living room, my body and mind tense and rigid, as I was about to experience sex for the first time in my life.

“Take it off,” Miyu said, using the pointer to poke my penis through my pants. My penis, now fully erect, showed its shape through the fabric of my pants, and when pressed, the rod-shaped bulge moved accordingly.

“There’s something like a stick in there…”

Sachiko was watching the scene with curiosity. Sachiko, with her mature appearance that matched her height, still had an innocent look due to her lack of sexual knowledge, and her side tail tied with a cherry hair accessory added a touch of childishness to her overall appearance.

“We’ll use this for sex. Why don’t you touch it, Sachiko?”

Standing in perfect contrast to Sachiko was my actual younger sister, Miyu—a girl whose body was still childish, yet whose tone and expressions made her seem far more mature than she should.

“Is it okay to touch it? I mean, this is the part of a boy that feels good… right?”

“That’s right. It’s the same as yours.”

Miyu reached her arm from behind and put her hand inside Sachiko’s pants, moving her fingers. The sound of “kuchu kuchu” filled the air.

“Fuaaah… nkuu… Miyu-cha… no… no…”

Sachiko seemed to be quite sensitive, probably because she wasn’t used to masturbating. The two of them were getting excited on their own, and just watching them made me want to ejaculate. Sachiko was so wet because of Miyu’s whispered teasing. How good is my sister at handling girls?

“Hurry up and take it off, Onii-chan.”

“Umm… okay.”

What they wanted was for me to take off my clothes—more specifically, to expose my erect penis. Sex with a girl was something I wanted, yet I was the one being ordered around. I was being instructed to expose my swollen male genitals to these girls, feeling both humiliation and excitement.

The whole thing started when I told Miyu, my little sister, that I could only get aroused by her. She pointed out my lack of experience with women, and it was Miyu who suggested that I get a girlfriend to make up for it…

Despite being immersed in the world of two-dimensional characters, I had always strongly wished to “lose my virginity” and “have sex with a real girl.” And now, I’m being ordered to take off my clothes and have sex with a girl, yet I’m hesitating. This should be an enviable situation for anyone.

“I’ll… take it off…”

The act of exposing my naked body in front of a girl made my whole body feel itchy. I’ve taken off my clothes in front of Miyu many times, but other than that, I’ve hardly ever been seen naked by men. Yamamoto-san undressed me, and initially, Miyu only saw me with my pants down. And now, I’m about to show my erect penis to a girl I just met today.

Sachiko seems to be ignorant, so she might not think much of it even if it’s big. But Miyu is behind her. In front of my sister’s friend, I’ll be revealing that I’m fully prepared for sex.

“You’re too slow. I’ll have Sachiko take it off for you.”

“Huh!? Me…?”

Sachiko’s ponytail twitched in surprise at the sudden change in leadership. I managed to lower the zipper, but I sank back into the sofa just before I could stand up.

“Instead, you take off Sachiko’s panties.”

“I’m going too… undress too?”

“Because it’s sex, you know? Do you understand that he’s going to put his penis in the place I just touched?”

“Uu… but… I’ve heard about it, but I’m scared to watch the videos… and also, right now, my… you know…”

Sachiko covered her mouth with her hand and whispered something to Miyu. She was holding her skirt tightly, and her cheeks were slightly flushed. It seems there’s some reason why she can’t take off her panties.

“So that’s how embarrassed you are.”

“Because if Onii-san sees me, he might think I’m a naughty girl…”

Sachiko was twirling the ends of her side tail with her fingers. Yamamoto-san used to do that too. I wonder if that gesture calms her down.

“He won’t see it from the outside so its a-okay.”

“Is it… really?”

Sachiko seemed convinced by what Miyu said, and she put her fingers on the elastic band of her panties and pulled them down, dropping them like a stone. The place that was hidden by her skirt, a place that I could even call a “secret spot,” was now exposed to the light of the room. And from there, a single thread was hanging down, shimmering.

Following that thread, a stream of love juice slowly dripped down, and Sachiko held her breath. She froze, her mouth in a straight line, and then, as if nothing had happened, she pulled up her panties again.

“Miyu-chan, I still can’t do it…”

“Yeah. Let’s stop for now.”

Miyu patted Sachiko’s head. The quiet living room was filled with a strange atmosphere. Sachiko seemed more hurt than expected, and Miyu comforted her for a while. Miyu gave me a sharp glare as I watched the two of them.

I couldn’t let the girls lead me any further, so I pulled down my pants and panties all the way to my feet. The suddenly revealed erection caught Sachiko’s attention, and she finally focused on me. In front of this girl who didn’t even know how to use it, I was standing with my hardened penis.

“This is… completely different from a girl…”

Sachiko swallowed hard. It seemed she had never seen a male organ before.

“Come closer to Onii-chan, Sachiko.”

Prompted by Miyu, Sachiko sat down between my legs. Unlike Miyu’s expressionless face, Sachiko was looking at my penis intently. Every time the shaft twitched, Sachiko blinked more frequently.

“Would it feel good for him if I touch it?”

Because of the difference in their closeness, Sachiko asked Miyu instead of me. Miyu didn’t answer and instead passed the question to me with a glance.

“It should feel good if you touch it.”

I’ve never had anyone touch me either. The only female body parts my penis has touched are two girls’ breasts. Since I’ve never had my penis touched by hand, I don’t know how good it feels to be touched by someone else.

“If that’s the case…”

Sachiko didn’t seem to resist touching my penis with her hands, and she started to pat the shaft with her palms. This act of stimulating a male organ with the hand, which I had been refused by Miyu many times, was my first proper skinship with a girl.

“Umm… aaa…”

The different body temperature and the softness of the girl’s skin touched me, and I couldn’t help but let out a breath of pleasure.

“It’s hot and hard.”

Sachiko wrapped my penis with both hands and checked the softness of the glans with her fingertips, or traced the line of the urethra on the underside.

“Aaa… it feels good…”

“Is the way I touch it alright?”

“Since it’s your first time, this much is enough. Even just being stroked feels really good.”

Sachiko didn’t know how to do handjobs. She just grabbed the shaft or poked it. But it was still a great pleasure for me. Miyu, who saw how clumsy Sachiko was, put her hand on Sachiko’s from behind and showed her the screen of her smartphone.

“This soft part is the glans, and the part where the hood is is the corona. It seems to be very sensitive.”

“Fumu fumu.”

Sachiko carefully stroked the places Miyu pointed out. Even though she was ignorant, her gentle touch on my penis was probably because she knew the sensitive areas well from her masturbation experience. She was better at distinguishing pain from pleasure than I expected, and I wasn’t sure if I could hold back my ejaculation until the end of the explanation.

“The hole at the tip is where urine and semen come out, and the line on the back that has a different color is the urethra, which is highly sensitive. The thing attached to the base, the scrotum… or is it the testicle? I’m not sure, but it seems like sperm is stored there.”

“There’s a lot to learn about sex, huh?”

Sachiko’s fingers reached below the scrotum. The moment her skin grazed mine, a sensation that made my knees shake with pleasure ran through my body.

“Ah, that part feels amazing…”

It’s good. It’s too good. I had no idea that being touched by someone else could be this heavenly. Now I understand why adults pay a lot of money to have sex.

“Be careful not to press or squeeze the round thing inside.”

“I will.”

“Also, when you stroke this rod, it’s better to move your hands up and down. Let’s try it based on Onii-chan’s favorite erotic video.”

“Okay. Understood.”

Without my knowledge, my secret collection of erotic anime had been transferred to my smartphone, and it started playing mercilessly. It was a video that shouldn’t be used as a reference, but I couldn’t say anything in front of the two girls who were watching the erotic anime intently.

“The key points are looking up, verbal abuse, and a female face.”

“L-Looking up… verbal abuse… a female face…?”

“Make a droopy expression as if you’re begging for something.”

I could tell which work Miyu had chosen from the sound that leaked out. It was a harem anime where the protagonist, who was a member of the home economics club, was asked to join by his childhood friend because he wanted a male hand, and then all the club members demanded erotic play from him under the pretext of “practicing to build a happy family.”

It’s not a sister-themed anime, which is good. Or maybe Miyu avoided it. In any case, there’s one thing I want to say. Normal couples don’t do verbal abuse or make female faces.

“Since Senpai is a p-pervert… these kind of things, you like it, don’t you?”

Sachiko’s grip on my penis tightened, as if she was scolding me. She was trying her best to imitate the erotic scene.

“Isn’t it embarrassing to be treated like this by a younger girl…?”

“Guh…!”

It’s unfair to match the lines with this situation. And to make matters worse, Miyu is watching me being pathetically treated by Sachiko… I was about to ejaculate. Stop, stop.

“Ah, I, was it painful? I’m sorry. I’m not good at this.

I suddenly stopped, and Sachiko misunderstood. She was trying so hard, and I felt bad.

“It’s not that. It’s not that…”

“Onii-chan was surprised because your hand felt so good.”

“Is that so? I’m glad I was able to do it well.”

I couldn’t say that I was about to ejaculate, so I was relieved when Miyu came to my rescue.

Sachiko laughed cheerfully while I let out a sigh of relief. But as I watched her, brimming with confidence as she declared, “I’ve got it memorized,” a wave of regret washed over me—was it really okay for me to have taught her something like this?

“Once you’ve given enough stimulation with your hands, it’s time to use your mouth.”

Miyu casually presented the next play, and my spirit soared. Stimulating the male organ with the mouth—in other words, fellatio.

There are opportunities to touch the penis, such as medical procedures or pranks between men, but licking is something that is absolutely not done. That’s why the act is special, and some people even consider fellatio an abnormal play. Is it okay to commit such a taboo?

“Do I just lick this rod?”

“That’s right. Onii-chan seems to want it very, very much.”

While explaining, Miyu glared at me, making sure Sachiko didn’t notice.

I understand, so please forgive me. I’ve asked Miyu for it many times, and even though she couldn’t do it herself, at least this is a result, right?

“Is this rod something to be licked?”

“It might be.”

It’s for insertion into the female hole.

“It twitches sometimes, and the size and hardness change. It’s kind of strange… it’s kind of cute.”

Sachiko looked at my penis with clear eyes, as if she was facing a kindergarten child.

“Eh… is it?”

Miyu was pulling back. I also think it’s strange.

“I just have to lick it with my tongue, right?”

Sachiko supported my penis with the fingertips of both hands and brought her face close to the tip. That was the place where Miyu had explained that urine and semen came out, but is it okay? Even if she doesn’t know about ejaculation, she should know what an excretory organ is.

“Um… can I lick it?”

Sachiko stopped with her lips just touching the glans and asked. I never thought there would come a day when a girl would ask me to lick her like this.

“I’d be happy if you did.”

“Okay.”

I guess this is what you call “losing your fellatio virginity.” Sachiko easily granted my wish, which had been more interesting to me than the actual sex. First, she licked the underside with her tongue. Then, she licked up to the corona, which Miyu had taught her was sensitive, and carefully licked up to the tip of the glans.

“Aaa… aaa… that… it feels so good…”

My voice trembled as my strength left me. The melting heat in Sachiko’s mouth was sliding down my penis. Sachiko, who was diligently observing each part of my penis, licked from the scrotum to the urethral opening at the tip, and her fellatio was more than enough to bring me sexual pleasure.

However, I got used to it faster than I expected, and the pleasure didn’t last as long as I had hoped. I thought it would be much more frustrating and unbearable.

“Sachiko, you might not have enough saliva. And when you lick the testicles, stretch your tongue to the back of the groin.”

“Feh?W-What?”

Sachiko moved her tongue inside her mouth and then brought her lips close to the underside, as if she was going to kiss it, and rubbed her wet tongue against it.

“Aaaahhhh!!”

I arched my back in pleasure. The sensation that was climbing up was completely different from what I had felt a moment ago. Sachiko’s licking also seemed to be getting better, and she was licking my penis, making “chupa” sounds and kissing it.

It’s heaven. I never knew there was a world that felt this good. I want to live the rest of my life being licked like this.

“Dwoes iwt… fwell gwood…?”

“Ah, so much that it made me… happy.”

“Ehehe… nchu. I’m glad.”

Sachiko smiled shyly while sucking on the tip of my penis. It’s a good sign that she can be happy when she’s praised. I just wanted to be licked by her, and I felt guilty for that.

“This is the next reference material.”

Miyu was staying out of the way so as not to disturb us, and she only showed the smartphone to Sachiko when necessary. Of course, the screen showed an erotic anime. It was a fellatio scene.

“T-This… I have to take it all in huh…”

“It seems like this is the main part. You have to make it gushy inside your mouth, and at the same time, stimulate it with your tongue…”

“Un un.”

The two of them were watching an erotic anime in front of a real penis. It’s a good thing to be diligent in your studies. I would even be happy if my assets were used for that purpose.

“Onii-chan’s favorite is to do it without supporting it with your hands… hold your hands on his waist and do it only with your mouth. And a female face is the basic.”

“Okay. A female face is the basic, right? Miyu-sensei.”

Sachiko’s brain was gradually turning pink. A pure, light pink color.

“Uhm, is it like this… Amuh… Jubuh… Juurh… Chubuh….”

Sachiko was breathing heavily and her cheeks were flushed as she screwed up her mouth and tried to put my penis in. She used the meatiness and mucus inside her mouth to the fullest, swallowing the root, and moving her tongue while sucking up the saliva that was about to overflow.

“Aaa, aaa… wait, I’m going to… aaaahhhh!!”

It was too sudden. I was killed instantly by the melting face and the sound of “nyuru, juppo” that came from her mouth.

“Mou… gu, aaaahhhh!!”

Dopyu, dopyu, dobyu, I ejaculated into Sachiko’s mouth, pushing out the semen onto her mouth.

“Nnn!? Nnn!!”

Sachiko was surprised to have unpleasant body fluids sprayed on her tongue, and she tried to take her mouth away. However, for Miyu—and especially for Sachiko, who was going to become my sex partner and take care of my sexual needs—it was not allowed for her to not receive the semen in her mouth after a fellatio. Miyu held me and Sachiko together to prevent her head from moving.

“Don’t spit it out, swallow it.”

“Nnn!! Nn!! Nnnn!!”

Sachiko resisted by shaking her head as hard as she could. In the meantime, my semen kept pouring into her mouth, and by that time, any feelings of pity had completely disappeared

“Hmm. You can’t?”

After my ejaculation subsided, Sachiko opened her mouth with a “kyupo” sound, and Miyu covered her mouth with her hand. It seems that she really wants to make her drink it, to match my preference of having her drink my semen.

“Nnn… uuu…”

Sachiko’s eyes were red. She was filled with tears, and this time, she slowly shook her head sideways, pleading with Miyu.

“I see.”

Miyu also let go of her hand. Sachiko was barely able to breathe, and her diaphragm was twitching. She probably realized that it was impossible to continue.

“Uu… Miyu-chan… f-fworgive me…”

Because of the saliva, half of Sachiko’s mouth was filled with semen. She looked like she was about to throw up, and she was holding her hand as a plate, her face turned downward.

“I guess there’s no choice.”

Miyu held Sachiko’s cheeks with both hands and gently placed her lips on Sachiko’s trembling lips, which were filled with tears. She twisted her tongue and went to take the contents of Sachiko’s mouth.

“Nnn…”

Sachiko’s face changed from pain to pleasure. After the kiss started, the transfer of semen was probably already finished, but Sachiko was still being licked inside her mouth by Miyu for a while.

“Nnn… muchu… haa. I’m sorry. I tried to make you drink it by force.”

“Feh… i… it’s okay… I’m okay…”

Sachiko collapsed on the floor. It was clear that it was because of my semen and Miyu’s kiss.

“You ejaculate too much, and your semen is too thick. It wasn’t like this at first, was it? Think more about Sachiko.”

“Don’t be unreasonable.”

If I could control the amount of ejaculation, I wouldn’t have had such a violent ejaculation in the first place. I never thought fellatio would be that good. I think I’m going to get addicted to it.

“Sachiko, wake up. We’re going to continue.”

Miyu slapped Sachiko, who had gone to heaven, and pulled her body. Sachiko somehow regained consciousness from her drowsiness and stood up.

“Continue…?”

When I asked, Miyu adjusted her glasses with her fingers together.

“Sex.”

The pointer extended to my penis, which had just ejaculated and was now half as hard.

“You can still ejaculate, right?”

I was anxious about the fatigue that suddenly came over me in response to Miyu’s question. In addition to the fake sex with Miyu the day before, I had just had a fellatio, and I had already done everything I could. Indeed, the goal for today was sex, but there is a limit to sexual desire.

“Miyu, I’m sorry… but…”

I don’t think I can ejaculate anymore. I was about to say that, but Miyu came closer to me, still exposing my penis, and straddled my lower body. Even though she was sitting shallowly, we were now in a face-to-face position. My half-erect penis was hardening again.

“Onii-chan.”

This time, her hand reached out. Behind my shoulder. Miyu put her hand on the backrest of the sofa and brought her face close to my ear.

“Semen… you can still release some, right?”

That whisper, like magic, instantly brought back my ejaculation desire. Where did I have enough semen left to ejaculate? I couldn’t believe it myself, but my penis was already preparing for the second round, just because Miyu asked me to ejaculate.

Miyu then got off my knee and patted the drowsy Sachiko’s head. Then, Miyu clearly spoke those words to both of us.

“I’ll have the two of you have sex.”

I noticed that my penis was already fully erect. I might not be able to stop ejaculating even if Miyu orders me to.