Eyes On me
So far - college guy(s?), one is the roommate of a friend and they meet when one goes to pick up forgotten keys. Lots of blushing and flirting. Looking forward to more.
Yuuhi ni Fureru Sono Mae ni
The first story is my favorite. Two roommates/housemates gradually fall in love with each other as the seasons change during their 4th year of college. One is an architecture student who doesn't connect with his father's new family and the other a painter who is almost always cheerful but also has (minor) angst with his family. Their connection was sweet and sincere and you wish you could see them in 10 or 20 years painting and building homes!
Toshishita no Kare no Kare