yaoi I forgot the title of

I remember the plot being about a male idol group, where one of them was writing fics about another one of the boys in the group and himself I think? And was a very popular fic writer among his own fans. One of the boys (not the one he was writing fics about) finds out by snooping on his phone and basically blackmails him to do shit with him/for him by threatening to tell the rest of the group about it.