My girlfriend's younger sister, who's pure and lovely but has a voluptuous figure, looked like she'd definitely make me want to sleep with her. I missed the last train, so I ended up spending the night with her. (Yu Tano SONE-976)

It was Saturday night, late at night, when I suddenly received a phone call. "Because I missed the last train, I'm staying here for the night~" It was my girlfriend's younger sister, 'You,' calling. I wanted to refuse, but a few minutes later I heard the doorbell ring. Then she barged into my house. She seemed to have been drinking, more approachable than usual, and there was more physical contact. And her chest was loose and saggy… It was practically an attempt to seduce me, pressing her chest against me. What if she finds out…? "I touched you a little." "Hmm~? You touched me on purpose?" Oh no, I'm in trouble.