She was laying there humping up at him and dazed by the continuous orgasm rolling over her, growing every moment in intensity. She wasn't really even thinking, and Gio's words don't really penetrate her brain, but she's chanting "Cum, Cum, Cum. So full, give me your cum."
He wasn't sure she was actually telling him to flood her pussy, but he wanted to, so he did. She opened her mouth like she was going to scream, and he slapped his hand over it to stifle the noise before his mom came to see what was happening. What he couldn't see was his mother standing in the door watching as her...