She wants to be in your good graces

"Oh, I don't want you mad at me," she answers. "Let me make it up to you. But how?"

You think for a moment, and you don't have to think long. You unzip, pull out your dick, and sit down on the toilet. "Ride me," you demand.

Rachel steps up to you, facing you, and straddles your legs. She slips your dick into her pussy, and before you know it she is wildly bucking your lap, her bountiful tits flopping in your face. Just like yesterday, your cock seems to fill every last bit of space inside her, and to grow bigger the longer you get fucked. Soon Rachel is weeping an orgasm, trying hard to keep moving up and down on you. You're not ready to blow yet, since Rachel was only enveloping the top half of your dick as she pumped you. You grab her ass and pull her into you, onto you, so that you are fully inside her. She shudders, and the full contact is enough for you to release your load into her, pumping repeatedly until her pussy is full of your juice and each spurt pushes a little out the sides.

You lift Rachel off by her armpits, and tell her to dress herself. You can see your cum starting to ooze out of her, and you make sure to tell Rachel not to change her panties before this evening's after school session. You zip up, scope out the bathroom to make sure the coast is clear, then leave Rachel to run off to class, where she will be several minutes late.