Cum in mum's panties.

After he handed over the PDA for mum to read, she read the task, before nodding in acknowledgement. "So you need to ejaculate in the panties I am wearing right now? Ok. Let me just go to my room so I can change out of them. You know how to masturbate right? I know I probably should have given the sex talk, but it always felt awkward."

"Yes, I know what to do."

"Good, now wait outside your room while I go get changed out of my underwear for you."

As she went to her room, Peter could barely suppress a giggle. Here he was about to do something very lewd with his mother's undies, yet she was being all modest, and proper about it- at least, as modest as you can be while offering to let your son cum in your panties.

After what felt like an eternity of anticipation, Peter eventually heard the door to his mother's room open. His mother walked towards him briskly before handing over a black lacy pair of undies. "Now go to your room, you know what to do." she said plainly.