Finish the pee tube

"Mom, I really need to pee now. It's probably time to cum again too, but I have to pee first"

He looked at his mother's resigned face. Her hair clearly had patches of dried cum in it, and it looked like there was some on her forehead as well. It shamed him to see her like that... and excited him too.

"Ok... let's do this." Heather pushed herself up and gently held the head of her son's penis in her mouth again and waited. Soon she tasted that piss filling her mouth again. Just the sensation of a fluid at body temperature was revolting, but she persevered. Soon John stopped, and she moved over to spit it into the tube. Over and over, eight times... and then a light at the base of the tube came on.

Excited to finally be over, Heather shouted "We're fine"... but forget to warn John first. His still pissing cock flopped out of her mouth, and she felt the warm fluid hitting her chest. She instinctively tried to duck and dodged, but that just left John pissing on the back of her head briefly as he cut off the flow.

"Sorry Mom," John said sheepishly.

"It was my fault... eww. Ok, are you ready to finish off the cum? Do you think you can make a big one for mommy?" Heather heard those words come out of her mouth and immediately regretted it.

John was shocked she adapted to this so well. He also hadn't finished pissing before they had filled the tube, but that could wait.