Vanessa Leon, aka Angel Daisy, is an incredible woman. I think her reactions are real, but she does seem to have a certain amount of acting ability as in one of her earlier scenes with a rather average stud said he was "too thick" and proceeded to squeal like she was being filled to the breaking point. As in all things porn it could be real or it could be a decent attempt at faking it. Diesel is not the best performer in the world and does tend to have issues staying completely erect throughout a scene. She's also done a scene with him in I Can't Believe I Took the Whole Thing 18.