[RJ200572] My Little Sister Isn’t Erotic!

An elder sister heads off on a perilous semen collecting quest
to stop her little sisters lewdification in this SEX BATTLE RPG!

You see, elder sister Hinata’s little sister Setsuna contracted
a rather strange disease named \”Succubus Syndrome\”…
She has a thirsty desire for… SEMEN! …and if she doesn’t get
enough of it, the horny fever-like estrus will set in leading to…(?)