Yes, she's completely submissive.

"Yes, Mistress," the small girl says, surprising both of you.
"Hey- who is your Mistress again," Laurie says, a bit annoyed.
"Well, both of you are. He's my Master and you are both my Mistress."
"...fine. Go on already."

The tiny girl comes over and starts to suck your cock without another word. If this bothers her, it doesn't show on her face.

"I have no problem sharing her with you, 'cuz. She's great," Jessica says.
"Yeah, she is. I guess...I guess I don't really mind sharing her either. That's what Family does- shares."

They watch the tiny gymnast shake her ass with delight as she hears them talk about her and also sucks your dick clean.

"All done, Mistress. May I fuck him now?"
"You may," Jessica says, "But it will be in the way that we decide. Listen to this..."

The pair lean in close and Laurie nods at her Cousin's suggestion. They go over to you two and order Yvette to drop into a split. She does so without question or effort.

What happens next is the really great part...

In tandem, the Cousins lift up the tiny Gymnast and hold her in the split position. They tell you to lay back and you let them mount the girl onto your hard as hell dick!

They lift her up and down, fucking her as hard and as fast as they want to- all while she holds that position!

Yvette cums at least two times that you could tell, while you hold out having just cum minutes ago.

She has one more orgasm and you can feel that you are getting close again...