However, to spice it up, what about this:
Maybe Mom is the first woman who manages to deep throat him. Or she is really great in bed.
Anyway: In the end, the guy doesn't tell her, that he is her son. Instead, he asks her about another date. She accepts, and from that day forward, they meet each day and fuck like mad.
I think they are almost becoming addicted to each other. I mean, mom loves the big cock, and the son loves her tight ass and her great blowjobs ....
Some time later - they still fuck like mad each day. Today is the guys birthday, and the woman confesses, that she once had a son that was in the same age - he even shares the same birthday, like her boyfriend.
Now, it's time for the son to confess ... or maybe even better: he is fooling her. He tells her, that his mom left him, when he was 8 years old ... but he doesn't know where she is right now.
The mom becomes suspicious. She asks him more details about his mother, and so she finds out that he is her son.
The woman is unsure about the future: Should they keep on fucking, even though he is her son ?
The son tells her, that he would love to keep on having sex with her, but the mom is still unsure ... but then, the son drops his pants and shows her his hard dick ... and so, Mom can't resist
"We have done so much, with so little, for so long, that now we can do almost anything with nothing." - Dave Marcis