Blake won rock paper scissors amd the right to the "first" use. She sat down at the desk while Jeff swapped places with her and now was entertaining Ava. With the two of them having fun, Blake focused on her first idea.
It took her about 10 minutes to do it all, and finally confirmed her changes. When she did so, both Ava and Jeff felt compelled to strip naked and lay down on their backs on the floor next to each other. Blake remained in the chair and watched her lovers with a sexy grin and one stocking clad leg crossed over the other. She had removed her heels though, and had set them aside for now.
Jeff and Ava then stuck their legs up into the air, and pressed their arms into the floor, bending their backs to lift their buttons off the ground and their legs up even higher. Jeff then felt his crotch begin to change, and his manhood was replaced by a very wet pussy. Then both Ava and Jeff spread their legs out slightly to the sides, forming a pair of 'v's.
Blake smiled and stood up. She lifted her left leg, and set her foot just above Ava's pussy, sliding her stocking covered toe into her folds. Slowly but surely, she sunk her foot in deeper and deeper, until she was halfway up her calf in Ava pussy. She shifted all her weight onto that foot, and repeated the same process, but now with her other foot, and Jeff's pussy. Her two lovers were silently moaning and subtlety writhing in bliss beneath her feet, while rigidly supporting her entire body.
Then both Ava and Jeff's legs began to wrap around Blake's legs, flattening out in the process. The interwoven pattern of either legs went up to just below Blake's dress. Both Ava and Jeff then began to shrink down in size until they just bairly had enough torso to contain Blake's feet. They both were the size of a high heeled boot now.
With her new "footwear", Blake began walking around the room, feeling the moist soft interiors of her "shoes" periodically quiver and overflow with cum as she stepped. And as they couldn't move much themselves, Ava and Jeff were more intoned with their interiors, and felt every tiny bit of movement Blake's feet made inside of them.
But now came the best part. Blake watched her two friends slowly lose their human shapes, and finish turning into a sexy pair of angle boots. Then she was teleported into the park about 10 minutes away from Jeff's house. Inside her mind, she could hear the lusty moans of her lovers and began the short walk back to Jeff's home, occasionally leaving a gooey heel print every few steps when one of them would cum.
When they reached Jeff's house, Blake climbed up to the room from the outside and snuck back in through the open window, just in time for Ava and Jeff to return to being full sized humans that could move freely. Jeff still had his pussy though, as Blake's foot was still lodged ankle deep inside of it.
"So, how was that you two?" Asked Blake while wiggling her toes inside of both of them. Ava couldn't say a word but nodded in approval, and Jeff managed to say "it was fun" before the pleasure became too much to keep contained for him too. And so, with her human shaped heels moaning lewdly on her feet, Blake finally ended her turn.
With the feet gone from their pussies, Ava and Jeff finally could take a breather. It was just enough to settle down though, as now it was Ava's turn to use the Chronivac.