Help me find this manga

First off this is definitely a manga not a manhwa. A bit older, like early 2000’s style art. I think the Uke has black hair and the Seme blonde. They are childhood friends, they are both mutually in love but they hide it from each other. They live together and share a bed (the bed may have broke and the Seme used that as an excuse to sleep in the same bed). Uke is a scientist that is adored/creeped on by his boss, Uke is oblivious to it, only thinks of Seme (this is more of a throwaway joke than a major plot point). The Uke is very influenced by “logic” and “efficiency” and Seme uses this to convince Uke that they should masturbate together to satisfy their needs efficiently. The only other thing i can remember is theres a scene where Uke is masturbating on the toilet and Seme comes in and watches at first but then touches him. They have sex later but still do not confess right away. And lastly, also that they confess to each other at the Uke’s workplace on a set of stairs, while coworkers watch/congratulate (except aforementioned boss who sulks).

Please help me find this if you can!