She is sitting there looking shy/nervous as shit. Then he gets his dick by her (he's doing all the work) and then he nuts.
99% sure it's her.
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"I'll never forget the moment during the lovely Alyssa Allure's scene in 'American Bukkake' where the fellow got out of his wheel chair to ejaculate on her face. It was grotesque but had a certain frisson." -Sock