It doesn't matter.

"That's right. We don't need to fight."
"Of course not, girls. I just hope my bustiness doesn't interfere," you heave a tit with both hands as you feel two wet cockheads poke you.
"How tight is his pussy? Was it made for me?"
"Of course, but his ass is still too tight. You will need to work that open manually."
Gemma sits on your pile of books. You move in front of her and open your legs and thrust your crotch at her. She sucks your cock as she fingers your pussy. When she pushes her entire fist in, you know you are ready. You lower yourself onto her cock. You can feel the gigantic cockhead on your inner thighs as she removes her fist and uses both hands to spread your lips. You sigh as she enters your mere minutes-old pussy. It fits her like a glove; not too small, but not too big either. You sink down until her cock is assaulting your cervix. Leaning forward slightly and thrusting your massive cheeks out, you invite your robotic shemale to join the fun. She doesn't waste time. You open your mouth wordlessly as her crotch presses into you.
"I should bring my own shemale, Sally, next time, since it looks like you have a spare hole." You suppose you do.
They start raising you up and pushing you down onto the double penetration. Gently at first, they soon pick up the pace to thrust up as you come down. Your tits heavily **** Gemma as they move in delayed time with your body. All the sounds of flesh slapping against flesh could give a large orgy a run for its money. With your hands on your hips, there's nothing for you to do; you are fully servicing two girls already. Without really even realizing what's happening, you feel yourself convulsing down there in a way you haven't felt before. Then after that, a cock squirting hard, forcing sperm into your fertile new female parts.
"Yeah, I hope that did it. We are gonna keep it up to make sure though," Gemma reminds you.
"Oh, that," you deadpan.
"Don't be so glum! We can make more like us! Add some accelerated maturity cocktails and we will never be alone!"
"Wait, I'm supposed to fuck them?"
"Well we can't both just keep knocking each other up! That's the great part about being a hermaphrodite...**** is easy...you can keep it in the family!"
"Oh, I see..."