Ichimai Goshi Fetish
From the same mangaka as Gentei Kareshi! The love story itself is nothing spectacular, but damn is it sexy ... (also I hate how this mangaka hints at switching but never shows it ;( )
ichigenme
This is really great! Though I didn't like the teacher in the second pairing. But the main story is honestly awesome. EDIT: I actually bought a physical copy of the first volume! This is one of the best university yaoi's out there. It just feels so realistic and I love how we get a view of their future too. Don't get put off by the art. It's beautiful where it matters. Especially Tamiya's facial expressions.
Himeiden
Well, this is interesting. The MC isn't able to feel empathy. And yet he's supposed to become a hero and save the earth.
Sorekara, Kimi wo Kangaeru
First two are really sad, last two have a happy ending. All have a melancholic vibe though
Breakfast Club