 If you liked
Dare ga Omae wo Suki dato Itta
|
 ...then you might like
Doushitemo Furetakunai
|
This rec is for ch5-6 of Dare ga.
Similar plot lines and character developments - a gay uke (with bad rumours surrounding him) and a het seme work in the same office space. The uke is indifferent toward everybody due to his past, but gradually, he warms up to the seme. The manner in which both the mangaka have dealt with this subject is mature and believable, and I encourage you to read the other recommendation.