I paid off the debt for the most beautiful sisters in the school, and then they barged into my house where I live alone. “Please go back home; you don’t need to repay the favor.” “No way.” “We don’t want to~☆”

On a day when Karen meddled with me during the day, night came.

After getting out of the bath and returning to my room, Erika was lazing around on the bed, fiddling with a tablet.

“Hey.”

“Hm? What’s up?”

“What are you doing?”

“Playing a game~. I can use this tablet too, right?”

“The tablet is fine. But why here?”

The scene felt oddly familiar. At least she wasn’t in her underwear, presumably having learned her lesson from catching a cold.

“Hm~? Because it’s comfy here?”

“Just do it in your own room.”

“The only place with a bed is here.”

“Then go buy a bed with the salary you get.”

“Eh~? What a waste of money. There’s already a bed here.”

“This is MY bed!”

“Ah, don’t worry. I won’t take it. See?”

Erika rolled over to the wall side, patting the empty space next to her.

“Come?”

For a moment, my mind went blank, and I felt dizzy.

Alright, fine.

“Hey, could you look this way?”

“Eh? What? When you say it so seriously, it makes me a bit nervous.”

Erika, who didn’t seem nervous at all, turned her slightly reddened face towards me.

“Close your eyes.”

“Wha— Really? Is it like that? Okay, but—”

“Just do it.”

I gently closed Erika’s swimming eyes with my hand and aimed my hand at her forehead.

“O-Onii-san?”

My fingers pointed at Erika’s exposed, white, and beautiful forehead. Take this.

“Hmph!”

“Ow!”

I flicked her forehead with full force, and Erika covered her forehead with both hands, lowering her face.

Phew. That was a satisfying sound.

Erika was curled up on the bed, trembling. Did I do more damage than I thought? A critical hit?

“Hey! What was that, Onii-san?”

She suddenly sat up. Her forehead was a bit red, but that seemed to be the extent of the damage.

“Nothing much. You were getting too cheeky, so I thought some physical punishment was in order.”

“Stop it! Who does that out of the blue? What if I develop some weird pleasure from this?”

“What kind of pleasure? I don’t want to know about your special fetishes.”

“Just get out already. And don’t come into my bed ever again.”

“I won’t! A guy who’s not gentle with a girl’s forehead won’t be listened to.”

“Ugh, you’re impossible. Fine, whatever,” I gave up and sat in the space Erika had opened up for me. I felt her eyes on my back.

“What now?”

She was staring, no, glaring at me.

“My forehead hurts. Rub it?”

“Excuse me?”

“It’s your fault, so rub it.”

“Fine…”

I reluctantly placed my hand on Erika’s forehead.

Her skin was silky smooth, sending a sudden thrill through my palm. Despite the forehead flick, physical contact with them still wasn’t easy on my heart.

“Hmm, men’s hands feel so different from my sister’s.”

“If you prefer your sister’s, go to her.”

“I didn’t say I didn’t like yours. So this is fine.”

“Okay.”

What was this situation? Why was I rubbing a beautiful girl’s forehead on my bed?

We continued our casual conversation, but engaging with a girl like this was unthinkable for me.

Erika suddenly changed the topic.

“Ah, right. So, Onii-san, what do you think of my sister lately?”

“Huh? Ah, yeah. You’ve been filling her head with weird ideas, haven’t you? Because of that, she’s been acting strange. Out of nowhere, she wants to hang out, or eat lunch together.”

“Strange? My sister is not strange. Wasn’t it fun to hang out together?”

“It’s not about whether it was fun. It was weird. She even seemed to have a different personality. What does she intend to do after finding out about me?”

I felt she had become overly assertive, probably because Erika had filled her head with strange ideas.

“Well, she probably wants to take care of you even more. The lunchbox had your favorite fried chicken, right?”

“Huh? Ah, yeah, it was good. Thanks.”

“Hehe. That was made by my sister with my help!”

“Really? Well, I’ll thank her later.”

“Hey, Onii-san, are you used to playing with girls?”

“Huh?”

“Ah, never mind. It’s just that you’re guarded for no reason.”

“Is that so?”

“I think my sister is drawn to you.”

“—What?”

“Though she’s not romantically interested, she might be in the future. So consider this a first move.”

“Why do you know such complicated words?”

“You think I’m stupid, don’t you?”

“Sorry, I did think that a bit.”

“I’m actually not that bad in academics. Anyway, I’ll also be supporting my sister from now on, so please cooperate.”

With that, Erika briskly left the room.

“—What am I supposed to do now?”

At the very least, it seemed like it would be difficult not to be conscious of Karen the next time I saw her.