I was thinking the same thing. It's infuriating when I tell the guy sucking my cock what to do, and he does it for a sec then changes to something that doesn't feel good. Dom pretending they're a sub.
No is not the right answer for a cocksucker, if he tells you he's cumming and wants you to suck it; HE WANTS YOU TO SWALLOW EVERY DROP, don't waste a drop of his precious cum.
The guy was a lousy cocksucker. I'll say this, when a man reaches orgasm, and he tells you to suck it, you suck it ! You do what he tells you to do to maximize his orgasm, not fuck it up. Send that big Daddy to me, I'll him holler and howl.