Mom shackled to the floor with her head between his legs

The first sensation John felt was a small burning near his wrist. He blearly opened his eyes and tried to sit up and look, but something held him back. He tried to rub his eyes to clear them, but again his hands were held down.

He was very confused; he didn't seem to be laying down or standing up, but laying at a funny angle on something. Finally he saw some movement in front of him, and after a few more blinks could make out a few TVs right in front of him.

The center one showed him strapped to some sort of table. Straps around his waist, wrist, legs, arms, and chest left him with very little movement, mostly just the neck area. His legs were spread out. Near his face were a few weird tubes. More importantly, he was totally naked. Panic started to set in, and he looked at the left monitor.

He didn't understand what he was looking at. There were a few test-tube-like things sticking up at the bottom of the screen, and then some sort of Y at the top with something top and center. Was it a hallway? He tried to twist his body for a better angle, and the camera shook a little as the thing on the top moved.

Frustrated he tried the right monitor, and that was obviously a side view of him, from a bit of a distance. In front of him there was something else, something that looked like a big dog. And it was starting to move... with its head right below John's naked crotch.

John finally panicked and started screaming. "NO, HELP!"

His mother's face snapped into view at the bottom of the left monitor. "John, where are you?" The sound of her yelling came not from the monitor but right below John. Puzzlement overtook fear. "Mom?," he said, practically a whisper.

He took it all in. The dog in the right monitor with its head nose up was no dog. He has missed the shape on the bottom of the central monitor, but now that he looked for it he could clearly see a naked woman's back between his legs. The left monitor must be behind and underneath, facing his mom. Which means those things at the top... the things his mother is now staring at with a horrified look are his cock and balls.

He heard a clanking sound, followed by "Oh my god. Who are you? What did you do to my son? PLEASE LET ME GO!"

"Mom, it's OK, it's me. I'm right here. Are you OK?"

It took some time, but once she had calmed down he asked her what she could see.

Heather was shackled to the ground. Her ankles and wrist had shackles and chains leading to bolts in the floor, and something was around her calves keeping her knees down as well. Her arms had a little movement to them, but not nearly enough. She was totally naked, and wasn't sure which was worse; the panic of not being able to move or the feeling of being so ****. Having a dick just above her face wasn't helping, even if it was her son's.

Right in front of her were four foot-long plexiglass tubes coming from the ground, each with a label. Those labels said "Spit," "Pee," "Cum," "Bile".

John listened to his Mother's description, and hoped she didn't notice how his cock had reacted when she said "Cum." Between that and the tantalizing view of her naked clevage on the cam, and the way her hair and sometimes even forehead brushed his cock, he was starting to get a little excited... and he thought he worked out the puzzle.

"Mom, I think we have to fill up all four tubes to get out"