She brought out the key to my chastity belt

I was jolted awake by my balls being roughly pulled and squeezed. I was astonished to see that it was my mother. She was covered in cum and looked like she had been put through hell and back.

I can't get enough of that big black cock, son." she began as she manhandled my aching balls. I have to have more of it. But, if these get to full I'll probably be denied that glorious sausage I crave. So, I'm going to make sure these are drained dry!"

I looked at her with wide eyes. What the hell was she talking about? She was acting like a mad woman. I would have tried to run, but her grip on my sack was like a vise.

"What are you talking about?" I stammered as she ground into my balls.

"If these get full, your wife will want to start a family with you. That means no huge cock for me. I can't let that happen" she said as she brought out the key to my chastity belt.

"NO! No, you're not thinking of..." I began.

"Where is your phone? Do you have your best friend's number on it? " she cut me off.

She released my sore sack as I handed her the phone. She began to dial the number and walked away, leaving me trembling on the downstairs couch.

She was acting like a mad woman gripping on my sack