Omegaverse

Yes, definitely. There is actually an omegaverse manga with that plot line here on mangago (forgot the title) and some others. Although many of the omegaverse mangas will have the omega as the bottom and alpha as the top.

Would like to read some, somtimes.

Yep. There's only one chapter translated, though the raws are also available here. And it's frikkin' hilarious! ε=ε=(ノ≧∇≦)ノ
http://www.mangago.me/read-manga/boku_no_high_spec_kareshi_sama/mf/c001/2/