Saiaku no Jinsei
SKIP THE FIRST STORY (aka chapter 1). Seriously the main love interest is terrible and puts his fetish before the actual person he's dating. He also can't read the mood to save his life (or his relationship). The second relationship is really sweet though! (if a little bit stalkerish at times) The main guy finds a dude that is constantly doing the right thing at the wrong time in the wrong place, so he's considered a troublemaker even though he's genuinely just trying to help. Main guy decides that he wants to marry the heroic tsundere in highschool, but looses track of him when the other guy gets expelled over a misunderstanding. Years later, he finds the guy again, and takes him home and does all but tackle him yelling "Mine!". It's great.
Kenka Bancho Otome - Koi no Battle Royale
Great manga! It has a much better flow to it than the anime did. Kinda want to punch the MC's twin in the face though. I wish people would stop using the "genderbender" tag for things that don't actually involve a person magically turning into the opposite sex, though.
Kiyona Yubisaki, Bukiyona Tsumasaki
This is really cute, and also very, VERY slow. Like, I'm talkin' taking-5-chapters-to-do-more-than-hold-hands slow. It's kind of refreshing, honestly. They're both just kinda moving the relationship at their own pace, which is pretty nice.
Takkun to Stalker Danshi - Kyou wa Takkun no Tissue o Tabemashita
Boku no Kawaii Stalker
Yet another cute stalker story (I just like those, okay).
Kajou Mousou Shounen