I've seen some famous amateurs like Heather Harmon execute a flawless deepthroat-to-completion performance, but I've yet to see a facefuck-to-completion.
I know directors don't like it because the cum isn't shown, but there are ways around it. The could either have sex as usual or just be facefucking her, he says he's about to cum, grabs her hair with one hand, starts to jerk himself off into her mouth with the other hand, and once the first spurt lands on her tongue, he shoves his cock into her mouth and keeps pushing her head further and further down his shaft until it bottoms out, and holds her there until he's done cumming.
Again, one of those scenes Rocco was born to do.