Not likely, but let's check on John

After the Doll girl, Maki, took John to where Betty and Neal were, she had guided all of them to the mansion’s medical clinic located in the basement. Right next to the dungeon for convenience she had joked. John didn’t see a dungeon, but to his eyes the gleaming medical equipment and examination tables that filled the medical lab/clinic were instruments of torture in their own right. Neal had been taken behind a curtain by Maki for a checkup, while Betty and John had been left with the other occupant of the clinic, who had requested their help in acquiring a sample and some measurements. Which is what they were currently doing.

“Huk, huk, huk!” Betty gagged as she forced herself to swallow as much of John’s cock as she could, without help. She was naked, except for a wide black elastic collar around her neck, and kneeling between John’s legs.

John, toes curled from the sensation of the blonde’s throat spasming around the first four inches of his dick. He lifted his hand with the intent of cupping the back of Betty’s head and forcing her face down until her chin mashed against his balls and every inch of his aching cock was buried inside her convulsing throat. Just before he could manage to cock strangle Betty he was dealt a stinging blow on the back of his hand.

“I said no help!” The mixed race Hawaiian female who had been introduced as Malia Hinako, a student in the medical department of the university, snapped at him. She bent over, causing the lab coat she was wearing to fall open. John had a clear view down the neck of her smock at her bare c-cup breast as she checked the collar around Betty’s neck to make sure John hadn’t disturbed it, or the sensors it contained.

“I need to see how much she has to push herself before the nanites adjust her throat. You’ve got enough girth that they’ll pretty much have to. We need to find out how much discomfort, or outright harm, it takes before they will modify her throat, and how long afterwards before they will restore it to default.

“Tomorrow we’ll test again, with you forcing your way down her gullet and see how the readings compare.” With that Malia turned her attention from Becky’s attempts to deepthroat John to her computer tablet. John assumed it was displaying the information coming from Betty’s collar, but for all he knew she was watching porn.

John saw Betty clench her ass, and her efforts to swallow his cock became more enthusiastic. Clearly the idea of him grabbing her by the side of the head and simply forcing his way down her throat appealed to her every bit as much as it did him. He had no idea what the appeal was for her, but he wasn’t going to argue with her. In the meantime he pressed his hands hard against his thighs to resist temptation. He watched as Betty worked her way down his cock, her spit and his pre-cum drooling out of her mouth and down the shaft of his dick. His fingernails dug into his palms when she slid down far enough that her airway was blocked and her throat began to spasm around his prick as her body demanded air.

“Interesting. Her nanites are scavenging air through her skin. Her blood oxygen levels are remaining normal. But, she still experiences the sensation of strangling. I wonder if that is merely a leftover instinct from having her airwaves blocked, or because she’s a kinky little bitch who loves to be choked out?”

John was only barely aware of Malia’s words. He didn’t know about Betty, but the feel of a girl strangling on his dick was becoming one of his favorite things. He felt his balls boiling and knew he was only a few seconds from eruption. Mindful of what Malia had told him at the beginning of this experiment he gasped out. “Cumming!”

Betty paused in her attempt to swallow John’s last two inches, and he could almost read the conflict that had to be going through her mind.

Malia bent over, flashing her tits again, and gave Betty an open handed slap to her bare ass. “If you dare swallow I swear I’ll pump your stomach, Betty!” she snapped out. Without looking behind her she snatched up a beaker from the top of a rolling exam cart. Her actions didn’t surprise John, she had explained, in boring detail, how she needed a sample of John’s semen to check his nanite level.

A shudder went through Betty and she lifted her head, pulling herself off of John’s cock. Even before the tip of his dick popped out of her mouth she was using both hands to give him a handjob and as soon as he did fall out of her mouth she angled his dick off to the side instead of toward her own face as was her preference. Malia held the beaker in place and skillfully caught John’s ejaculate as his balls unloaded.

John knew it was silly, but he felt pride as he watched Malia and Betty’s eyes widen as jet after jet of his semen splashed into the liter sized beaker, and slowly filled it up. Even he was impressed when he finally tapered off and there was only an inch or so of room left.

Malia shot him a smile. “Impressive. I would call this experiment a success. I theorized that showing you the beaker ahead of time would have some effect. I expected some increase in production, but not this much. I should have known not to underestimate the male ego. It seems your nanites are responsive enough to amp up your production levels to an extreme amount if you focus hard enough on doing so.”

John looked smug, but the look vanished when Malia continued. “Of course having depleted your reserves it will likely be a couple of hours before you can unload again.” She shot him a smug look. “The nanites are incredible, but they do have a limit.”

That look annoyed John, and he really wanted to pull Malia onto his lap and split her cunt with his cock. He might not be able to unload a load, but he could still fill her with thick meat and make her scream.