Ok ok ok....I admit she dit it all wrong....Yes she sat on him....She should indeed lift her cunt as he came...I'd be licking her cunt and suck his cock and after he came all over her pussy and my face I'd let them fuck more and lick them both for a second round!
I'm adding this great video to my premature favorites collection.....even though we don't see when she actually first sits on his cock it does appear that she just started moving on his cock causing an instant premature cum so that is what I am assuming.