My Little Sister Is the Best F*p Material

Volume 1 Chapter 03.1: My Sister’s Rules

I can only get off to my sister now.

Since being caught masturbating, I have continued to use my sister as my masturbation material, as I did initially. However, what has changed is that I have started to feel pain when I imagine having sex with other girls.

I don’t even feel like starting up an erotic game, and I’m even considering deleting the system file, which is a pretty extreme thought, but I’ve become unable to get off to anything but my sister.

I am aware that this is abnormal in the eyes of society. But is this really my fault?

Indeed, Miyu has no charm, and it was I who asked her to receive my ejaculation. Still, I have no intention of changing this claim. — My sister is tempting me.

“Miyu, can I talk to you for a moment?”

I knocked on the door, left it half-open, and spoke to my sister, who was in the room. Miyu’s after-school routine is pretty much set, either going shopping on the way home or going straight home and studying in her room. She probably doesn’t play with her girlfriends much, let alone with guys. I was surprised that she didn’t flinch when she encountered my masturbation, but it’s no wonder that a homebody like her doesn’t have a boyfriend.

Or – this is a really creepy assumption – it’s possible that Miyu actually likes me. Because, you know, there’s no girl who would drink the semen of a man she hates.

“What’s up?”

After hearing Miyu’s reply, I slowly opened the door. As expected, Miyu was opening her reference book at her desk. Should I say she’s girly? The room, which was mostly white, had a faint tinge of red, and on the bed was a cushion made of polyester fabric that looked like it would feel good to touch.

“I’m horny, so I came to masturbate.”

The words came out of my mouth more smoothly than I expected, and Miyu acknowledged the bulge in my groin with an unexpectedly puzzled expression.

“You know, Onii-chan…”

Miyu turned her chair around and faced me. Her voice was low-pitched. This was my sister’s lecture mode.

“From my point of view, it’s like being asked to take out the trash while I’m taking a bath.”

She delivered a perfectly reasonable argument with a straight face. I should have also considered the timing when her studies would end.

Still, for Miyu, drinking a man’s semen is like going to throw out the trash. For me, the biggest mystery in life is why Miyu even drinks my semen, but maybe there isn’t as much reason as I think. … Or is there?

“Sorry, the timing was bad. My bad.”

I lost the momentum I had when I entered the room, and my genitals also became flaccid. I came here knowing it was a long shot, but my purpose was to find out why Miyu helps me with my masturbation, and if she stopped drinking for me because of that, it would be pointless. I have to be more careful.

“Can you cum quickly? I can finish my studies, so if you want me to come to your room at nine o’clock sharp, I will?”

Miyu proposed it as if it were a given. This girl is declaring that she will come to drink her brother’s semen, but how can she be so emotionless?

“Thank you. I’ll take you up on that.”

I agreed to Miyu’s proposal and returned to my room.

It’s nine o’clock at night, so it’s twenty minutes later. Until now, Miyu has only accepted my ejaculation when she was bored in bed or on the sofa. It’s the first time she’s come to my room on purpose, even though I asked her to.

… Will she really come? Even if she doesn’t come, I can’t blame her. For now, I’ll go back to my room and masturbate.

“Haa.”

I took off my underwear and sat on the edge of my bed. I resented the obedience of my penis, which was growing erect, and placed my right hand around it.

From now on, my sister would come to this room, open her mouth in front of my penis, and wait to receive my ejaculation. Moreover, she would drink it as if it were a given. What an erotic situation, I thought, but another desire also arose in me.

(Can I get her to give me a blowjob…?)

Among all the masturbation materials, I loved the image of a girl putting the male reproductive organ in her mouth the most.

If she gave me a blowjob, it would be inevitable that the girl would look up at me, and I would look down on her. While being aware of this position, the girl would carefully suck the part of the man’s body that urinates and ejaculates. This act, which is unnecessary for reproduction, is nothing but a service, and it must be the ultimate pleasure to obtain both carnal and dominant desires at the same time.

If it were just before I ejaculated or just after, to clean up, I think Miyu wouldn’t mind. But Miyu absolutely refuses to give me a blowjob. Is she resistant to touching the excretory organ directly? I would gladly lick her if she asked me to, though.

“…”

What kind of desire is it to want to lick my sister’s vagina?

I’m pathetic. I’m pathetic, yet I get an erection that burns when I imagine it. What color is Miyu’s vagina, I wonder. I’ve had vague fantasies about having sex with Miyu, but I’ve never thought about what her labia looks like. Can’t I at least let her see me naked?

I was getting greedier as I masturbated. It’s all because of Miyu’s ambiguous attitude. If she had rejected me from the beginning, this wouldn’t have happened.

“Knock Knock. Onii-chan, I’m coming in.”

Miyu came in, making the sound of a knock with her mouth. It was already time. It’s just in time. I was about to cum anyway.

“How are you? Are you ready to cum?”

My sister, who only showed her face from the door, asked. As if it were nothing special, my sister no longer reacted particularly to seeing me masturbate.

“I can cum anytime.”

I sped up rubbing my penis and urged Miyu to enter. Miyu closed the door quietly and came up to me. Then, Miyu sat down on the floor and opened her mouth in front of my penis.

Miyu pushed her long hair back over her shoulders and tucked her bangs behind her ears just in case. The buttoned pajamas firmly guarded Miyu’s cleavage, but just being able to worship her chest directly was enough fuel for me.

Miyu’s mouth, slightly moist with saliva. I shook my head, trying to get rid of the thought that it would definitely feel good to insert it inside her mouth, and gave my reproductive organ the stimulation it needed to ejaculate.

“Miyu… I’m cumming… haa, aah… ugh… cumming, cumming…”

In Miyu’s mouth, which was leaning forward so that it wouldn’t overflow, my penis, which was contracting repeatedly, released a white, viscous liquid. I felt like I still had some semen left, so I rubbed my penis again and immediately surrendered to the ejaculation sensation that came again.

The difference in the amount of ejaculation when I processed it with a tissue and when I gave it to Miyu was obvious. Looking at the obscene liquid that had accumulated in Miyu’s mouth, I wanted to increase the amount and make her drink more.

Miyu swallowed the semen, which was enough to fill an espresso cup, with a gulp. At first, Miyu couldn’t hide her disgust at the taste, but now she seemed to have gotten used to it, as she swallowed it without moving a single eyebrow.

“Mm. Goodnight.”

Miyu left the room after finishing the processing, without even enjoying the afterglow.

I didn’t even have time to thank her. I don’t know what Miyu thinks about receiving my ejaculation.

I was left alone in the room, wrapped in silence, and applied a tissue to the tip of my penis, which was still dripping with cowper’s fluid, and threw it into the garbage can, which had become quite eco-friendly.

I realized that in order for my sister to process my masturbation, I needed to minimize the time and effort it took. Although she didn’t tell me directly, I rarely got turned down after I started asking her to do it when she looked bored.

At the same time, I sadly realized something. To put it bluntly, it seemed that Miyu was only “providing a place to process semen without dirtying the room,” and she didn’t seem to be accepting my sexual desire out of any particular desire.

Miyu has told me to shorten the time it takes from when I ask her to when I cum as much as possible. In other words, she wants to be untouched except for the moment of ejaculation. Maybe it’s time to give up the faint hope that she might like me.

It wasn’t something I should be shocked about. I should be grateful for this much, and from the outside, our brother-sister relationship was abnormal in every way.