She has a counter-proposal

She looks up at you with sad eyes. "I know you are upset by my past behavior, John. I've done terrible things to you. I promise I will make things up to you. Here is my counterproposal. I think I can convince one of my girlfriends to come along for a real threesome; several of them owe me big time. You can have both of us, we both will be humiliated, and you can have satisfaction, as well as sex. Then after that, I'll have sex with you at every tutoring session. If I stop having sex with you, you can stop tutoring. What do you think? Is that good enough?"

You think a minute. "On one condition. After the threesome, you have to tell Chad that you had sex with me. And if he does anything to me, no more tutoring. I don't want your little girlfriend telling him and the next thing I know, I've got a busted jaw. Oh, one more thing. Pick a girlfriend with big tits. Yours are nice, but I want variety."

Mariah pouts a little at your last remark, thinks about your conditions, and then she looks resolved. "Okay. If I want to graduate, I don't have much choice. You have a deal."

You grin evilly at her, knowing she's in a bad spot. "To seal the deal, I want a blow job, Mariah. Where's a good place?"

She sucks her breath a little, and then flushes red. She gulps and says, "Come this way." She heads down the hall. You follow.

She takes you to one of the girl's bathrooms on the third floor that are out of the way and not used very often. She opens the door, you walk in, and she locks the door. By the time she turns around from the door, you have dropped your pants to the floor. All this talk has you semi-hard and making a lump in your boxer shorts.

Mariah walks to you and kneels at your feet. She takes a deep breath, which flexes her tits before you. Your cock stiffens more at the sight of them and her nipples. She mutters to herself, "For graduation." Then she pulls your underwear down.

This vision of teenaged beauty drops her jaw and gasps. "Oh, my God," she whispers. You notice her breathing speeds up. She looks up at you with a hint of lust and awe in her eyes. You're confused. "You're huge, John." You're still confused. Since you started showering alone in middle school, you have nothing to compare to, except the porn movies you've bought off the Internet.

"I'm not huge. I'm only eight inches."

She looks back at your groin. "Chad is only about six, maybe six and a half. And you are wider by half. Average is five and a half inches. I looked it up on Wikipedia one day." She gazes up at you again. "I should have no trouble getting someone to be in the ménage à trois with us. Jennifer is a size queen, I know for sure."

She returns to staring at your now-rigid shaft. She reaches for it and gently runs her fingers up and down its length. You bend toward her and groan involuntarily from the wonderful sensation. She licks her lips and takes the head into her mouth. You almost pass out from the pleasure of her lips and tongue on your flesh. She starts bobbing back and forth, taking about five inches at a time, and after about a dozen repetitions, you grunt loudly and cum in her mouth. She sucks hard and takes every bit, except for one small drop that escapes her lips and drips on her white shirt.

She pulls off of your cock with a smack and smiles up at you as you see her swallow your load and lick her lips. It's just like in the porn movies. Her pale-white skin is flushed with excitement.

"Come to my house on Sunday at, oh, two o'clock in the afternoon," she says rather breathily. "We'll have our threesome, then." She stands up.

"Um. Er. Where do you live?" you asked, still recovering from her fabulous blow job.

She pulls a pen out of her skirt and grabs your hand. "This is my address." She writes on your palm. "It's just seven blocks from here. I'm looking forward to seeing you then, John, whether you believe it or not." Then she kisses you briefly on the cheek and leaves the bathroom. You just stand there in a daze.