Susan Ayn is the most extraordinaire swallowing freak I have ever seen (along with Paris Showers).
Yet none of the studs seems to be able to properly shoot his load in her delicious mouth... What a pity.
Plus, I have noticed that most of the big cock studs have very low sperm productions. One or two strokes only, whereas a normal man has 7 or 8 strokes. Any reason for that ?