RenRen's manga / #sex friends to lovers(2)

This mangaka loves 3p and group sex. Multiple couples, someone is always a little loose at first though, to say the least. First couple - slutty Uke with many sex friends. There's one he likes the most for the sex, one day invites his twin brother to come along. The twin is the serious type and seriously fell for the Uke. He basically got the Uke to be with him exclusively using unmatched sex skills LOL

Younger seme who has to abandon piano due to permanent finger injury meets older uke who’s just been dumped by his older lover because the wife found out. They started by licking each other’s wounds, but soon fall in love. Yuuya, a high school student, unexpectedly bumps into Kiriya-san while walking down the street and ends up saving the older man's life. The two are neither "friends nor lovers," but form a companionship in order to listen to each other's troubles. Will this friendship turn into love?