I like fiction about twisted relationships and all that, and I'm a fan of Enzou, but I didn't really enjoy this one. Not that the premise wasn't interesting, but the story just didn't seem to be written well. It was just freaky sex with a little bit of story inbetween.
I'm saying I like you, too, ONII-CHAN.
http://www.mangago.zone/read-manga/momoiro_shoukougun/uu/momoiro_shoukougun-chapter-1/27/
If you've already read raws please don't post spoilers in the comments. :(