Spreads the Feminizer injection to sexual partners

"How do you like my cum inside you?" The Feminizer asked, giving a few more short pumps.

"Oh, I love it." Stacy moaned as her pussy throbbed around the still-leaking dildo inside her.

"It's going to make you a very special girl." The Feminizer promised as she pulled out. A thin string of pink fluid stretched from the tip of her strap-on. She carefully wiped it away with a gloved finger and pushed it into Stacy's mouth.

Stacy sucked greedily on the finger, feeling the gunk tickle through her insides. "What's happening to me?" She asked, feeling hot and a little dizzy as new changes spread through her abdomen. While the transformation was purely internal, it still had a physical element, which caused Stacy to squirm and moan as it stretched her orgasm out for a full minute.

"Just a little alteration to your uterus." The Feminizer said, climbing off the table and starting to clean up. "You won't need to worry about periods or pregnancy, your womb is being repurposed."

"What do you mean? Repurposed for what?" Stacy asked, a little inkling of dread making it through the waves of ecstasy.

"It makes Feminizer serum now." She said simply, putting away the strap-on and moving to remove Stacy's restraints. "It releases it during arousal, making you extra wet and highly contagious."

"Contagious?" Stacy repeated, perplexed.

"Yes dear, any boy who puts his dick in you will find himself in the same situation you were recently in: permanently hard, heightened orgasms, every climax making them a little more feminine until they're entirely female, just like you." She finished removing the restraints and held out a hand to help Stacy to her feet.

Stacy stood up and looked down at her body. Her breasts were large and imposing, she had to move them aside to get a good look at her body below, they felt heavy in her hands. Her hips had become wide while her chest and shoulders had narrowed. Her arms and legs looked so thin now, without a trace of her former beefiness. Between her legs her pussy was barely visible, just the top of her slit peaking out the bottom of her flat mound. Long strands of platinum blonde hair fell into view as her head tilted downward. She tried to imagine what it would feel like to feminize a man like she had been.

"Quite a view, huh?" The Feminizer gloated, clearly proud of her work. "Oh, I almost forgot, I had a 'uniform' made for the new Captain America. I had to guess at your new measurements, I hope it fits. The Feminizer rummaged around a bit before coming back with a star spangled string bikini.

Stacy tried on her new outfit, still reeling from her total transformation. Having such a feminine garment fit her perfectly really drove home just how much she'd changed.