This story might have a different plot armor ajhaha... The story goes like they're childhood friend and fck buddies for a long time already and then they lost interest with normal sex so they explored new way. Then the 2nd male lead will appear which will attract the uke in a romantic way. Then the 2st seme will be possessive and more domineering. The uke might get tired with and 1st seme then will eventually make out with this blond boy. Then they'll meet each other secretly while the 1st seme somehow knows what the uke was doing. After some time the 1st seme will be aggressive and try get the love of the uke. Then after being fck buddy with the blond guy, he will eventually return to the main seme. That will make the readers frustrated and experience 2nd lead syndrome.
I thought the main lead seme must be the blonde guy? I mean because he's a good boy kind a guy... But after i read the comment most of it thinking the main lead is the black haired seme.... Hmmmmmmmmm