Make her work for it

You grim at her and bump yourself up, slowing her down.
Hazel looks at you, beneath her, and grim back.
The moments after that are messy and clumsy and fun, as you move and shake your hips and she laughs and tries to keep herself in top of you, like a cowgirl riding a bull in a fair.

Neither of you is really trying, but you enjoy it, and you notice that Hazel starts to mover her hips clockwise and counter-clockwise, switiching and teasing you - much to your delight. The girl has more experience than you thought, and she is earnest to learn and try new things

So you speed yourself up and starts to really pound her.

Hazel takes your face between her hands to hold herself as you pump her pussy, and you take advantage of that to kiss her deeply. Then you pull her legs, making her spread then wider, both to hold herself and to give you more space to move.

She's moaning now, and almost jumping up and down on your cock, and you know the girl will have the orgasm of her life soon, so you slow yourself and put your hands on her small breasts, pushing her up and letting her ride you.

She tries. She moves on top of you ardently and eagerly, preparing herself for the orgasm, but she is too excited and you endless tease her. Soon Hazel is at the edge and tries to slow herself... Then you bump up again, hard and deep this time, and she falls on top of you with a muffed scream.

You kiss her and flip her sideways, fucking her as you lay side by side. She starts to cum and you keep pounding her, and her orgasm doesn't stop. Soon she starts to lose control of herself completely and starts to struggle, but you move on top of her and keep pounding, taking care to kiss her often, as to prevent her to scream to loudly. Her orgasm is massive, so intense she can't even properly move, her whole body shaking.

And then it's over.

Hazel is exhausted as she never was before and kisses you and rest, laying there.
You look at her and she's out, and you can feel yourself pulsing inside of her for a while, but you can't stay her the entire night...
So you let her rest and sneak yourself back to your room.