I think I spotted an error. On page 1, the girl tells Aihara to "wait in Aihara's room". Shouldn't it say "wait in Haruki's room", since Aihara went to his friends house to pick up the game?
>doing it with your friend's older sister in his room
Been there, done that. I dated my friend's hot sister for six years. The question is, did my little sister ever screw a guy in MY room when I lived at home...?
So he changed himself for her, huh? That's nice.
Great ending though. Good on the brother for not interrupting his sister's sweet loving time with his buddy.