That Time My Sex-Friend Became My Step-Sister - Chapter 15
Chapter 15
The suddenness of it sent my mind into a panic.
“What are you saying?”
“I don’t want to disappoint when the time comes. So I want to practice,” Madame said.
Madame turned her serious gaze toward me.
I’m a guy, after all. Her offer was undeniably tempting. But giving in to Madame here felt like it would be unfair to her.
Swallowing hard, I tried to think calmly and persuade her.
“That kind of thing should be with someone you love.”
“But you did it with someone you didn’t love, didn’t you, Anjo-kun?” she countered.
She wasn’t wrong. I didn’t exactly love Yuina. It was probably the same for her. Our purely physical relationship was likely why it lasted so long. I had no solid ground to argue against Madame.
“Won’t you regret this?”
“I won’t.”
Her eyes were resolute, unwavering, as if nothing could change her mind.
“Fine. I’ll let you practice. But I won’t touch you at all. Is that okay?”
“If that’s fine with you, Anjo-kun.”
Madame reached for her glasses and nodded. As we enjoyed the food that had been served, I glanced at her.
I never would’ve pegged her for the type to suggest something like this. As a member of the disciplinary committee, I assumed she’d be strict about such matters. It was my own bias, but I thought a friends-with-benefits arrangement was the kind of thing Madame would despise most.
Yet, far from showing disgust, she boldly asked to practice with me. My preconceived image of Madame was completely shattered.
After finishing the meal, Madame went to pay the bill.
Once she settled the payment, she took my hand and gently pulled me toward her.
“Shall we go?” she said.
I followed her, my hand in hers, wondering where we were headed but too nervous to ask.
After walking for a while, a condominium came into view.
“This is my place.”
She led me into the building, and we took the elevator to the fourth floor.
Inserting the key into the door and turning it to the right, it opened with a click.
“Come in.”
“Excuse me.”
The apartment was a typical 3LDK—perfect for a family. It was quiet, with no one else around, giving it a lived-in feel.
We passed through the cozy living room, and she led me to a Western-style bedroom.
“This is my room. Make yourself comfortable.”
Following her words, I sat on the floor, settling in deeply.
Madame grabbed a juice from the fridge, poured it into a glass, and placed it on the table in front of me.
I gulped it down, wiping the sweat from my forehead.
“Are you nervous?” she asked.
“Yeah. How could I not be when I know what’s coming? Is no one else home?”
“My parents are at work and will be late. No need to worry.”
My lower half was already in battle mode. I felt embarrassed by how easily my body reacted just thinking about it.
“For this kind of thing, you usually shower first, right? Go ahead.”
Prompted by her, I left the room and headed to the bathroom. I washed thoroughly with body soap, paying extra attention to my groin. After rinsing off the suds, I got out quickly. Drying off with a towel, I wrapped it around my waist and returned to Madame’s room. Her eyes widened in surprise at my appearance.
“Just a towel?”
“We’re doing this, right? Might as well make it easier.”
“True.’
She clearly wasn’t used to seeing a guy half-naked. Her eyes darted back and forth, stealing glances while trying to look away.
“Lie on the bed,” she instructed.
Following her prompt, I lay down on the bed. Madame, her face flushed, leaned over me and swallowed hard.
“I’ll do my best.’
※※※
On the way back from Madame’s place, I let out a deep sigh and scratched my head.
I did it. I let Madame take the lead and ended up letting her service me. I knew I had a strong sex drive, but I didn’t expect to lose control like that.
To be blunt, Madame’s technique was clumsy. It was her first time, so that was expected. It was just simple up-and-down motions with no finesse, done so cautiously it barely felt good. But this was practice, meant to help Madame improve. I gave her pointers on what felt good while she worked on me.
Madame was earnest to a fault. Watching her try so hard made me want to root for her, and before I knew it, I was genuinely offering advice. The fact that she managed to finish me off was a decent achievement.
It was completely dark outside by now. Thinking Yuina might be worried, I hurried home.
Madame asked me to practice again next time. Since we’re not going all the way, and she’s offering to take care of me, I have no reason to refuse after this. Honestly, I was surprised to find myself in this kind of relationship with Madame.
We haven’t known each other long. I never imagined something like this would happen. But with Madame, I feel at ease. She doesn’t love me, and knowing that makes it easier to let my guard down.
Switching my mindset, I opened the door to my house.
Asuka Madame’s POV
I did it.
I invited Anjo-kun to my house, had him in a compromising state, and went through with it. I wasn’t the one being touched, so I wasn’t scared, but I was incredibly nervous. While Anjo-kun was in the shower, I paced around my room restlessly.
When I learned Sousuke had someone he liked, I lost myself.
I kind of knew. Sousuke rejecting confessions probably meant he liked someone else. So when I heard it from his mouth, I felt a strange sense of acceptance.
The shock was real, but I realized it wasn’t the right time to pursue him. I decided I needed to prepare for when Sousuke gets heartbroken, and my chance comes. That’s when I heard that Anjo-kun had a sex-friend. The old me would’ve turned red and gotten angry. But instead, I thought, maybe Anjo-kun would let me practice.
When I asked, he was surprised but agreed.
I brought him to my house and showed him my room. Even Sousuke had never been here, so I never imagined letting another guy in first.
Seeing Anjo-kun come out of the shower, I steeled myself.
A boy my age with just a towel around his waist—it’d be a lie to say I wasn’t excited.
I had him lie on the bed and looked down at him.
As expected from someone experienced with girls, Anjo-kun was calm. Even when I lifted the towel, he didn’t flinch.
I don’t remember much after that.
I was desperate, following Anjo-kun’s advice while moving my hand up and down. I had no idea how much pressure to use and was overly cautious, but I managed to get him to the end.
It was my first time making a guy finish. The sense of accomplishment was real. I was surprised by a lot of things, but I’m glad I invited Anjo-kun today.
After he left, I sat at my computer and searched for “how to give a handjob.”
“Whoa, so that’s how it’s done.”
Just moving up and down wasn’t enough, according to the articles. I grabbed a cucumber from the fridge and practiced on it as if it were a penis. The tip seemed sensitive, and the articles said to be careful with it to avoid causing pain. I traced the underside of the cucumber. Anjo-kun mentioned the frenulum was a good spot to stimulate. The most standard technique was focusing on the shaft. Looking at illustrations, I practiced on the cucumber. I got a sense of the right pressure today, but finding the balance between too soft and too hard was tricky. With a few more practice sessions, I’ll get the hang of it.
The articles said that moving the skin along the shaft stimulates the frenulum and head, which feels good.
I’ll practice with a cucumber every day from now on.
To make Anjo-kun feel even better next time.
And so, I kept practicing with the cucumber while looking at the illustrations.
Hotaka’s POV
As soon as I opened the door, Yuina came rushing out from the back.
“Where were you?”
“Does it matter?”
Trying to slip past her, she grabbed my hand.
“Wait.”
“What?”
“You smell like another girl.”
Yuina sniffed the air as she said it.
Seriously? I didn’t think I was that close to Madame, but her scent must’ve stuck to me.
“Explain yourself.” Yuina asked, frowning.
I hesitated, unsure how to respond. Yuina and I aren’t anything anymore. There’s no reason to feel guilty about what happened with Madame. But her intense aura made it clear she’d be furious if I told the truth. So, I held back.
“No way, did you do it with another girl?” she asked suddenly.
I froze, unable to respond. That was enough for Yuina.
“Hmm, I see. You won’t do it with me, but you’ll do it with someone else.”
“It’s not like it’s any of your business who I’m with.”
“Maybe, but it pisses me off.”
As she spoke, Yuina dug her nails into my arm.
“That hurts!”
“If you’re gonna do it with someone, do it with me!”
“I already said that’s not happening.”
And please, don’t be so loud in the house. If Yuni-san hears, I’ll be kicked out. Yuina was too worked up to care.
“Hey, it’s election season, right? Why do something to make me mad?”
“I didn’t think this would make you mad.”
“Liar. Then why hide it?”
“I just didn’t think it was worth mentioning. I didn’t lie.”
My calm response seemed to irritate her more, and her pretty face twisted in frustration.
“Then, then, do it with me!” she shouted.
Tears glistened in her eyes.
She turned on her heel and stormed upstairs. The sound of her door slamming echoed down to the first floor.
“What happened?” Yuni-san asked, startled by the noise.
“We had a bit of a fight.”
“I see. That girl gets mad over the strangest things,” Yuni-san said with a worried smile.
Yuina’s tearful face, who had disappeared upstairs, was burned into my mind and persistently lingered as I stood there.






































Yeah…. Trash. Dropped it. Exactly the kind of story that turn into NTR. From the childhood friends pov it’s completely fucked.