My Sister, Who I Thought Was Just A Kid Until A Little While Ago, Seduced Me With Her Panties, So My Parents Set Me Up Several Times While We Were On Vacation... Yayoi Hamabe

After a long time, I returned to my parents' home. I used to get along well with my little sister Yayoi when we were kids, but we grew distant after my rebellious phase. When I saw her again after so long, she had grown up to be strangely provocative. But maybe she still hasn't fully become an adult, because her panties were constantly visible... No, was she showing them off...? A single piece of fabric digging into her crotch, unable to fully cover her big ass. There's no way I'd get aroused by my own sister... Then my parents went on a trip. Even alone together in the house, the panty flashes didn't stop. And my sexual desire toward my sister didn't stop either. Once I made a move, that was it—while our parents were away, it was sex and more sex. My little sister couldn't possibly be this cute... or this erotic... Even as I thought that, I kept doing it.