My Stepsister is My Ex-Girlfriend - Volume 11 - Chapter 5

Final Chapter: The Fifth Day for Just the Two(?) of Us

Four Days’ Worth of Debt

After getting back from the school trip, perhaps due to the fatigue of traveling and not being used to it, I passed out before the sun had even set. By the time I woke up, it was bright outside, meaning it was already morning, despite it feeling as if I’d only slept for two hours tops.

Where’d the night go? In exchange, I felt very clearheaded, but I still felt as if I’d wasted time. It was so early in the morning that when I went down to the living room, none of the rest of the household had woken up yet. When I entered, I saw dinner from last night on the table, wrapped in plastic. I was hungry, so I happily ate it.

We had the day after the school trip off, so since I’d been uncharacteristically active during it, I decided to take things slow today. Thinking that, I sat on the couch and opened a book.

It wasn’t long until our parents got up and went to work. Though we were off due to the school trip, it was still a normal weekday for everyone else. It felt like I’d gained something.

After a bit, around ten, Yume finally appeared.

“Morning...”

“Morning,” I said.

Though she sluggishly entered the room, she’d properly changed out of her pajamas and was now wearing a long-sleeved blouse and a skirt. It was a familiar outfit of hers, but it felt strange to see, especially after spending the last few days being around her in summer clothes.

After finishing the black tea and toast she’d prepared for herself, she went to the bathroom before coming back to the living room. Then, she walked over and plopped down on the couch next to me before tilting over and lying on my thighs.

“You did good,” I said, looking down at her.

“Mm...” Yume practically grumbled.

“You free today?” I asked.

“Yeah, but tomorrow I’m going to meet up with the student council members to give them their souvenirs.”

“Wow, dutiful as always.”

“Not really. This is normal.”

I closed my book and put it on the table before gently stroking Yume’s cheek.

As I did, Yume looked up at me. “They at work?”

“Yeah. It’s a weekday for them.”

“So they won’t be back until later?”

“Yeah, probably.”

“Wanna...do it?”

Well, if our parents aren’t home, it’s only natural that this topic comes up. Just as Isana had so enthusiastically mentioned, Yume had said that we’d do things after getting back home. Even so...

“I dunno, I’m kinda out of it.”

“Ah...” Yume made a sound of understanding. “Yeah, I get that. I kinda wanna take it easy too.”

After being prohibited from engaging in any of these activities for four days straight, I knew that, at the very least, the flesh was willing even if the spirit was weak. Well, I’ll give it two hours or so. If I’m in the mood, I’m sure it won’t be too late to change my mind then.

So, with that, we didn’t kiss or even touch each other’s bodies. We kept a naturally close proximity as friendly siblings and spent the morning that way. When lunchtime came around, we made pasta together, adding a frozen potato salad and an instant soup on the side. I decided to keep things simple and easy.

After eating, I felt like I could rest again, and this time, it was my turn to lay my head on her lap. All the while, we read and sporadically conversed. At one point, Yume’s phone chimed from the table. Yume picked it up, looked at it, and began responding to whatever message she’d gotten.

“Who is it?” I found myself asking.

“Asuhain-san.”

She’s initiating the conversation? I kinda didn’t imagine her to be the type to do that, but I guess it makes sense with how she was acting. If she knew I was using Yume’s lap as my pillow right now, she’d probably explode with anger.

For a time, Yume continued messaging her. Sometimes she’d chuckle or mutter something under her breath, and I watched her the entire time she did it from my position on top of her lap. When I sat up, I repositioned myself so that we were shoulder to shoulder and then wrapped my arm around her waist.

“Hm? Mizuto?” Yume asked, confused.

I positioned myself so that I was able to give her a hug from behind. I gripped her tighter, pulling our bodies closer together, and buried my face into her neck.

She smiled, amused. “Feeling neglected?”

But I didn’t respond. Even after smelling Yume’s scent, I felt as if my lax mood had returned. As I lightly breathed into her, I heard her softly moan and squirm.

Then, in a kind of amused but alluring way, she turned to me. “You wanna go...upstairs?”

Instead of answering her, I playfully nibbled on her earlobe, making her giggle.

“Sorry, Asuhain-san,” Yume said, texting something before putting her phone away in her pocket.

After that, Yume turned towards me and put her lips on mine, unable to hold back anymore. After a few seconds, Yume smiled at me teasingly. “Hard to believe you were so calm just a few seconds ago.”

“There’s a debt to be paid—four days’ worth.”

There were hours until our parents got home. We hadn’t been able to find any time to really be alone during the trip, and it was hard to know when the next time we’d really be able to be alone at home would be. I needed to make sure that I got my four days’ worth of payment today.

As we got more and more into things, we began to leave the living room, meant for our family, to my room—a private space. Suddenly, Yume’s phone dinged again, leading both of us to silently look at her pocket.

“You...okay with not answering?” I asked.

“Y-Yeah. I told her I wouldn’t be able to respond for a bit.”

Okay, then. Let’s get things back on track. We held hands as we went upstairs and then into my room. It was just as I’d left it—books in messy piles, scattered across the room—but at least my bed was free of any obstructions.

I pushed Yume down onto my bed, eliciting an excited squeal from her. I mounted Yume as she lay there and kissed her again. This time, it wasn’t a playful kiss, but an exciting one that would push both of us even further into the mood.

Suddenly, her pocket beeped again, making us both silently stop kissing and freeze up. Yume took out her phone and looked at it.

“Who is it?”

“Asuhain-san,” Yume said after just looking at the sender before looking at me. “Can I leave my phone on your desk so it...doesn’t get in the way?”

“Yeah...”

Yume got out from underneath me and went to my desk, not too far away. She fiddled with her phone before putting it down and coming back.

“I...turned off my notifications.”

“Got it.”

Well then, let’s get things back on track. Yume sat on my bed and slowly put her hands on my shoulders. This time, she mounted me and began kissing me again, her soft body pressing against me.

Yume softly moaned as I wrapped my arms around her, putting my hands under her blouse. As her smooth skin ran against my fingers, I slowly lifted the hem of her blouse and moved my hands up until I found the hook of her bra.

In the next moment, there was a click, signaling that her bra was unhooked. As soon as it was, I felt something boiling inside me. It was a strange feeling, and no matter how many times it repeated, the feelings I had in this moment would never fa—

Suddenly, there was a ringing from my desk as a call came. Both of us fell silent. Okay, well, getting back on track... But then it rang again. Okay, well, getting back— Then another ring. Okay, well— Then another ring.

“Come on!” Yume pressed her unhooked bra against her and got off the bed, quickly moving to her phone. Most likely, if Yume kept ignoring the call, Asuhain would get suspicious, so Yume’s only move here was to pick up the phone. “Hello? Oh, yeah. It’s okay, don’t worry. Mm-hmm. Mm-hmm. Huh? Now?!” Yume turned to me, a troubled look on her face as she held her phone with one hand and her bra with another. “Well, I’m kinda in the middle of something... Huh? N-No. Not like that!” After repeating this kind of frantic talk about two or three more times, Yume hung up, letting out a sigh.

“Asuhain? What’d she want?” I asked nervously. I didn’t need to ask who it was.

A very guilty look crossed Yume’s face. “Well...you know how I was supposed to meet up with everyone from the student council tomorrow? They wanna do it today...”

“Oh...”

“B-But I said no! The original plan was for tomorrow anyway!”

“No...you should go,” I said, shutting out what I really wanted. “Your relationship with Asuhain is important. We have all the time in the world to find another opportunity.”

Besides, I don’t want Asuhain to get any funny theories in her head. After all, that’s the girl who went out of her way to say that she’d end my existence.

“Huh? But...” Yume worriedly looked at me while pressing her phone against her chest. “Th-This might be weird coming from me, but...are you okay?”

Nope. Not at all. “Yeah, of course. Who do you take me for? I have complete control of my desires.”

“Okay, well in that case...” Yume put her hand to her chin, thinking before walking over to my bed and kneeling on the floor. “Mm,” she grunted, widening her arms, asking for a hug.

I was at a loss for a bit, but I hugged Yume and I felt her hug me back. It was like she was impressing the shape of her body into mine. I could feel her squeezing me with everything she had. She knew I was being blue-balled, so she made sure that the softness of her breasts, the bumps of her ribs, the rhythm of her breathing—all of that was burned into me. After a little bit, Yume reluctantly let go of me and looked up.

“Can you...hold back until later?”

It was like a mom asking her kid if they could be patient. “I can,” I said, wryly smiling.

“Also, I think you know already, but...”

“I do. Don’t worry.”

Allow me to explain. Yume is the type of person who doesn’t approve of her boyfriend watching porn. “Okay, then...” Yume stood up and rehooked her bra while walking to the door. “I’ll be back later. Seriously, sorry!” she said, putting her hands together apologetically before walking out into the hall.

“Hello, Asuhain-san? So actually...”

Her voice got softer as she walked away, and eventually, I couldn’t hear her anymore. I crashed back onto my bed and let out a long sigh while looking at the ceiling. I bet this is gonna happen many more times. In the first place, we have to be careful so that our parents don’t catch on. It’s not a huge problem to add one more person—Asuhain—to the list. But even so, this time...just this time...

“This sucks...” I found myself complaining.

Internally, I resolved that I was going to make sure that this was a debt she paid back in full for sure.