That dude is so lucky. What is happening is that he is having two orgasms at the same time, one in his cock and the other in his ass (technically a prostate orgasm). The extreme twitching and vocalizations are from the ass pleasure and would have continued for several minutes had the top not pulled out. I want that experience so much.
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When a man twitches like that when he cums, THAT's when you cup your mouth around his cock and start sucking!! mmm...
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They should have sent him even more over the edge by playing with his nips as he was cumming.
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