Uke after many years returns umbrella to seme (was senpai?? ) . Seme doesn't seem to recognise uke and uke tell him to forget about it.
Seme and uke later meet at work. Uke is photographer working with seme.
At some point uke tells seme both him and his sister are manipulative or something like that

past Uke was introduced to seme by his sister , his sister saying uke was her boyfriend

In the end seme remembers him after talking with his sister and discovering the fact his sister had feelings for him and that uke seemed to be dating seme's sister but in fact they weren't and they both had feelings for seme so they got together to support each other

sometime in their past Seme had taken a photo with the uke. Seme after getting together with uke in the end wants to take uke's photo. But doesn't want to. much rather be one taking photos or something like that

who needs drugs when you got yaoi