Last time we checked, guys don't generally decide to use one of their own perfectly nice t-shirts clean up their semen until after they've already orgasmed. Oh well, different strokes and all that, etc., etc.
Yeah, it's a little odd that this guy is so into the fact that he's jacking off onto his t-shirt. Is this just one of many assorted household objects that he's cum on? Does he have a thing for t-shirts in particular? We can't be sure, but he's hot, he's got just the right amount of body hair, and that dick is pretty impressive. Those count as redeeming qualities, right?