Yoshinaga (吉永 ) Katsuhiko (強彦) had been dating your younger sister since they were around fifteen. You were two years older than the both of them, and as such, didn’t see much of Katsuhiko. Though when they both graduated and moved in with you to go to university…You saw them a lot more.

Truly, you never claimed to be a good person. You never claimed not to notice how nice Katuhiko’s ass looked, or how pretty he was. Even if he was…Straight. And your sister’s boyfriend. That can change. You've always loved a good challenge, after all.