Not necessarily BL, but the undertones are quite UNsubtle so it was really cute Tall-soft-puppy-lilbro!Seme x Short-cold-reliable-bigbro!Uke. The ending was... a bit disappointing as it hinted that they won't be together for a long time (just like how siblings would actually be) but.. it's fine ig :)
Seme is somewhat~ of a fuckboy (or at least used to be) and offered to fuck Uke cause the latter's "curious" how it would feel. Along the course of their friends-with-benefits relationship, the Seme fell deeply in love while assuming that the Uke loves someone else (Although it was not the case, of course).
Pheromoholic