Just read the raw before you judge ryota. If you can't speak japan, you can see the drawing right. If you just need to see sex scene, see in the raw. Or find another manga, but you don't have right to say anything bad to ryota just because his naive and pure personality, even saku love him so damn much. And the big brother isn't that bad.
I watch the anime first then read the stories, and yeah it bit different but i love them both, especially the anime, its rrally make me bump into the tears, coz i really feels their love.. Really deep and strong, but i only can see they making love in the manga wkwkw. So i love both so much (づ ̄ ³ ̄)づ