could be this one. there is a flower giving scene when they are old men at the end. but the blonde is the seme so maybe not. http://www.mangago.zone/read-manga/calling_ootsuki_miu/
No its not that one..but thank you
might be. it's not flowers tho, it's flower-looking lanterns so i'm not sure http://www.mangago.zone/read-manga/senya_ichiya_shitone_no_himegoto/
OMG¡¡¡ yes ..thank you
i need to find a yaoi manga that i read a long ago..I only remember that the uke was long blonde hair and he was very slutty. the seme saw him having sex with alot of guys in a shop or bar i think they both work. At the end the seme give him flowers i think because that was a promise they made and they were already old.