Please help me find this yaoi

It's about a boy (uke) who has an older sister and always wants to see her happy so when his sister comes home and tells him some guy disrespects her (or something) he goes looking for him so he can leave his sister alone (Ig) when he finds the guy (seme), the boy goes on a few dates with him to seduce him so he can leave his older sister alone, after that he dumps him so when he gets home he tells his sister she doesn't need to worry about the guy anymore, after some person kidnapps him and takes him home, when he wakes up the person tells him if he doesn't get back together with his brother he will break up with his sister and since he wants his sister to be happy he gets back together with the guy. Tried my best at explaining what it's about about hopefully I did ok ╥﹏╥