He tweeted a long time ago that he never cums from blowjobs (or more accurately, it happened to him that day for the second time in his life, presumably).
Looking at their Onlyfans videos (with too much time on my hands during lockdown), the only thing he can cum from (other than his hands) is when he's fucking. But even then he has to pull out and jerk off a bit, because porn.
Other than that, it always ends up with him jerking off (usually while Chad is sucking his balls), and often there IS a cut to shorten some of that self-rubbing time.
So maybe that's why he often looks bored when Chad is sucking him - he knows he'll never cum from that