http://www.mangago.me/read-manga/shiawase_gohan_maki_to_hanazawa/ its shounen ai sort of
First of all, DEFINITELY try "Negative-kun To Positive-kun". It's ADORABLE AF & fits all your criteria!! One of My all time Fav Fluff!
2nd, even though it's REALLY popular I'm gonna take my chances - try Moegi Yuu's Katekyo. It takes only the first 2 chapters for them to become a couple. After that it's mostly their lovey dovey stuff. Although there are few dramas but they are nothing major. It resolves pretty quickly.
im looking for a yaoi where the guys are already a couple and it kinda shows their everday life as a couple and them going on cute dates and stuff. no big drama, just couple stuff.