A yaoi manga where the uke is a character from another manga.
The story starts when a brother of his who is from a really rich family (quite possibly a prince?) comes home to get him.
As it turns out, his brother and him has a relationship. Mostly on the brother's part who is in love with the uke and is very possessive.
I remember a bar scene where the seme found the uke there and the seme was so possessive that he did the nasty with the uke on the bathroom.

I think the seme was a foreigner.

Thank you in advance 😉

Maybe Ouji to Joujin Or its sequel Himegoto wa Ouji no Tashinami ?

Suit o Kita Akuma same series as mentioned above has the whole bar thing bathroom doing
focuses on the president couple though