Mom mistakenly grabbed her son's dick and paid for it

"Sonny, do you want your mother to make you feel good, tell me honestly?"

I take a risk, but I hide my naked sister under the blanket so my mom won't notice

Son, what are you hiding under the blanket? What's so hard under there?

"Daddy, let me be in Mommy's place. You'll see, I can do it!"