Jigoku ni Ochite yo, Onii-chan

[Mellenward]

They had sex by the end but they remained enjoying the ntr/cuck kink since the Mc got a gf but the sister still likes to watch, Mc can only get an erection with his stepsister or when she is watching

He did fuck his GF before he knew that Yuna was watching though, he just got harder after she popped up lol. I would like to have seen what happened to Narumi after the timeskip though, did she keep Motoyama as a pet and became Yuna 2.0?