The uke was a masseur/therapist I think in an high school/college and every guy there loved to go to him to get some massages.
The seme is an athlete (i don't remember the sport completely though) and he also went to the uke to get some massages and also some advise, and eventually the seme falls for him, and the uke and the seme even sleep together, but the uke excuses his behavior and does not take it seriously because of his youth and also because he used to have a relationship when he was in school himself with another athlete which ended and eventually the they quitted speaking together at all.
In the end of the manga the uke and the seme ends up together though, so happy ending!

Anyone know which manga this is? Please T_T

Is it Yajuu de Hatsukoi by Yamato Nase?

Yup. Thank you so much for your help!