After putting in the last, and with Lisa humming in approval, he had a sudden idea, and focused on her crotch.
Lisa's eyes shot open, and looked at him. "What did you just do?"
Ty grinned mysteriously, and just said "Feel around your cervix."
"Feel around..." She suddenly gasped, and then moaned. "Oh these are inside??"
Ty grinned before making another addition, and Lisa gasped again.
"Another tongue! In... ohhh, I see what you wanna do."
There was some movement underneath her abdomen, and she stretched out long while she gasped every so often.
At long last, she looked up, and she spread her legs wide for him to see.
"Look at it, safely locking up..."
He could see, with her pussies gaping widely, piercings on the inside of each cervix. But they're not piercings.
Lisa clenched her teeth, and he could clearly see a zipper move across the piercings, joining them together. After a moment, the cervix was definitively closed, and it looked like nothing could really open it.
"Now the other one! Say goodbye to those marbles...!"
The other cervix closed, but now he could see a glimpse of another tongue, inside of her womb, moving a zipper across the cervix itself, closing it. This all turned Ty on endlessly, with a woman with a womb and pussies this dextrous...