If you've seen his other scenes, while he's eating/smothered in ass and pussy, he gets extremely hard (balls very hard) and so he asks the girls to just blow him and not jerk. A couple of scenes, the girl jerked him and he prematurely ejaculated a huge load.
It´s amazing how his cock holds his cum inside his balls. Look how erect he is whilst his face is being suffocated by his girlfirend´s juicy and now doubt fat cunt, it´s amazing how he doesn't just ejaculate into the fatter girl in red´s lusciously sucking mouth instantly yet he last several minutes more