I can't tell whether he's ever faking it or try to go over the top just to get people to like him and his work, but I'm pretty sure that unless your body reacts to it well, you can't keep on cumming and cumming again, plus if you look at his muscular contraction and his goodbumps, I think his experience of cumming and certainly with anal stimulation seem a bit more intense than others might feel it.
I call quickly recall Sean Summers who started off as top-only with plenty of military scenes, then he got fucked on College Dudes, and in that first scene, the way he moans, and his muscle contracts, it might seem a little over the top, but I think he feels it plenty. And when CF brought him over, he's finally ready to embrace how getting fucked feels for him. Shame there's not more scenes CF could capture.