He's too distracted

Josh continued to fumble over his words as his eyes were once again drawn to her ample cleavage and the large cock sticking out beween the gap in her dressing gown. He could have sworn it never looked that big attached to him. Perhaps it was his mother's smaller frame that made it appear bigger or the rush of unfamiliar hormones from his new anatomy but he couldn't take his eyes off it, more than that, it was taking all of his willpower not to reach out and touch it.

His mother cleared her throat, snapping him back to reality. She glanced downwards "Really you little pervert?!" She exclaimed "watching your mother jerk off is how you get your kicks is it"

Josh started to protest, he tried desperately to deny he was watching her but she quickly cut him off, "you expect me to beleive that when there is a literal puddle on my bathroom floor AND the front of your trousers are dripping" she chuckled "I can't believe you, just like your father, filthy little voyer". Josh's face flushed, although even he was unsure if it was embarrassment or arousal at this point.

"Perverts like you have to be taught a lesson" she sneered, an unfamiliar, sinister smile forming on her lips "and I know just the thing"