[SSNI-432] (English subbed) I’m That Scumbag Who Gives Into Temptation When My Girlfriend’s Busty Little Sister Provokes Me With Her Bra-Less F-Cup Tits. Yua Mikami

The protagonist comes to the realization that he is dating the wrong sister.

Luckily for him, Sister Yua is an out-of-control slut that doesn’t take long to hit on him.