With a mechanical dildo

Taking the vial containing Ultraboy’s sperm, Dr. Erika Bluder slipped it into her pocket before walking over to the exam table that Ultramom was laying on. Taking a clear mask with a tube attached to it, Dr. Bluder slipped the mask over Ultramom’s mouth and nose. The evil doctor then turned and opened a valve letting a clear gas flow through the tube and into the mask. Ultramom tried to hold her breath, but after about a minute and a half the superheroine was **** to take a breath and breathe the gas in. Erika smiled and left the room for awhile, leaving Ultramom and Ultraboy restrained.

The restraints keeping the mother and son duo prisoner contained negotonium, which prevented either from using any of their powers to escape. Negotonium was a mineral that could be made into metal that drained superheroines and superheroes like Ultramom and Ultraboy of their energies. The result was that the ultra duo was as weak as any normal person and unable to break the restraints.

“Mom, are you ok?” Ultraboy asked, trying to turn his head to look at Ultramom.

“Yes, I think so.” Ultramom responded through the mask.

“What is the gas she is making you breathe?”

“I don’t know. I can’t feel any affects from the gas.” Ultramom answered.

After a couple of hours of leaving Ultramom and Ultraboy to contemplate their situation, Dr. Bluder returned to the room where the mother and son duo were restrained. The doctor walked over to where Ultramom was restrained, shut off the gas, and removed the mask from the superheroine’s face. “You and your son have probably been wondering about the gas I’ve made you breathe. It is a **** to increase your fertility.” Erika said to the duo. “I’ve modified your son’s sperm so that when they reach your eggs, a new superbeing will grow at a very accelerated rate and will be open to my suggestion. This means that you will be ready again in a few days, and I will have an army of superbeings to follow me.”

“I won’t let you put that sperm inside me!” Ultramom said defiantly.

Dr. Bluder laughed. “Like how your son was not going to cum? Look at yourself, you are powerless and can’t escape…do you really think you can stop me from inseminating you?”

“You are sick.” Ultraboy said, unable to do anything besides watch as the villainous doctor started to position some other equipment around his mom. He watched as Dr. Bluder placed electrodes on his mom’s breasts, her thighs, and around her pussy. He then saw the doctor positioning a large vibrator mounted on a piston between his mom’s legs that was aimed at her cunt. Ultraboy watched as the vial containing his sperm was then pushed into a slot on the bottom of the vibrator.

After she was satisfied that everything was set up, Erika Bluder moved over to the controls. “The electrodes will help stimulate you Ultramom while the vibrator fucks you. When you orgasm, the vibrator will release your son’s modified sperm deep inside you.” Erika then pressed several buttons on the control panel and the electrodes started making Ultramom feel pleasure in her breasts and between her legs.

“Uuuuuuuuuhhhh!!!!...Uuuuuuuuuuhhhh!!!!.....Uuuuuuuuuuhhhh….Uuuuuuuhhhh!!” Ultramom threw her head back and moaned as pleasure poured into her bound body.

Next the vibrator between Ultramom’s legs was activated and it was pushed into the superheroine, penetrating into her cunt. Once inside Ultramom the piston started making the vibrator pulse as it thrust the vibrator in and out.

“Uuuuuuuuuuhhh!!!!.....aaaaaaaaaahhhh!!!!.....uuuuuuuuuuhhhh!!!” Ultramom cried in pain and pleasure as the vibrator was **** deep into her with each thrust.

“Fight it mom, don’t orgasm!” Ultraboy yelled at his mother, watching with fear and arousal as she was fucked by Dr. Bluder’s machine.

“Your mother can’t resist, she will orgasm, and will be inseminated with your sperm. It is a matter of biology now.” Erika said a matter of factly.

“Uuuuuuhh!!!...Uuuuuhh!!!....Uuuuuhh!!!....Uuuuuhh!!!” moaned Ultramom as an orgasm started to build inside her body.