He cums

"Mom!" he tried to say, intending to tell her to get out. But what really came out sounded more like, "Mom...OHMYGOD MO-O-M"

With that his cock erupted like a volcano and cum shot out everywhere. He tried to stop it, but that only made him cum harder. Semen splattered all over his chest. More landed on the sheets. Some splattered on his mom's night gown and on the laundry she was carrying. One wad even stuck right on her left nipple.

"Holy shit!" his mom exclaimed.

He was still cumming and a burst of semen hit his mother right in the chin, barely missing her open mouth.

Then he lay there, out of breath and momentarily unable to move. He knew he was about to get in big trouble, but all he could do was bask in the momentary high of his orgasm. He was aware of what he had screamed as he climaxed, and was also a little afraid that his mom would think he had been thinking about her.