" (and that's kinda the whole plot) "
Really, that's all you got from the plot? I think you are missing the whole point of the story if you think it's just about sucking dick, for fucks sake! :)
That manga is definitely Saezuru that mentioned by @KIRA ^
Also. U should re-read it again until the latest update, the plot is rich and it has a deep story...! :) it still one of my favs since ever
Lol true. It's pretty laughable to say that it's kinda the whole plot for a manga like Saezuru.
I know right. Hopefully the OP will have a read of the comments section to that manga because they seem to be missing the entire point of the plot.
Don't punch for saying dis but when I think of this manga this is what came to my mind I know it deeper than this don't worry but I didn't wanted to write a big description
It's a yaoi with Yakuza and the boss is a below kinda fucking with everyone and one day he tries today suck a new comer but he won't get hard (and that's kinda the whole plot)