Sarah refuses because your still being trained

“I would, buuut my mom said I need to train him more before I lend him out!”

All the girls groan with disappointment and you sigh with relief. The thought of Sarah’s classmates gangbanging you was a scary idea even if a small part of you can't help but feel a bit aroused at the thought.

“What kind of training?” One of the girls asked.

Sarah leans over you and spreads your butt cheeks, “I need to stretch out his O-ring. Mom said it’s important to stretch it slowly, if you don’t it can get damaged when you use it too much.”

“Stretch it with what?” Another girl asks.

Sarah sucks on a couple of her fingers and without warning slips two into your exposed asshole. “Mom said to use your fingers first,” she slowly runs her fingers in circles spreading your butthole. “The idea is to make it stretchy, mom says that the o-ring is a muscle and if you take your time and train it properly it will always retain its tightness.”

At this point your dick was hard as a rock from your sister playing with your ass and exposing you to a class of horny futanari. Against your better judgment you reach down and grab your dick to start masturbating. The girls keep discussing different methods they heard about how best to prepare a boys asshole. But it didn’t take long before one of the girls noticed you jacking yourself off.

“Ewww, look Sarah’s **** is jacking off!”

Sarah reacts first by removing her fingers from your asshole and tries to swat your hand away from your dick.

“Bad ****, no touching your dick without my permission,” but you manage to finish before anyone could stop you. Shooting your load out onto the classroom floor and collapsing next to it with exhausting bliss. Sarah stands up and stomps her foot in anger, “Doug! How could you do that in front of all my friends!”

In your post orgasm state you can hardly bring yourself to really care about the consequences but not wanting to upset Sarah anymore you weakly apologizes.

“Sorry Sarah, when you started touching me I couldn’t help but get turned on. You're just so beautiful and strong.” You made sure to add some extra compliments to please her.

Sarah's face blushes a little with the compliments and the anger starts to fade away, “Well of course you can’t help but get turned on, BUT that is no excuse for touching yourself. Mom made it very clear that I can’t let you get away with this, I’m going to have to punish you.”

The idea of a punishment brings you quickly out of your post orgasm haze, “Please Mistress, I said I was sorry!”

Sarah shakes her head, “Sorry isn’t enough. You to show you are sorry by cleaning up your mess.” Your sister says pointing at your cum that you collapsed next to it. But when you go to wipe it up with your hands your sister stops you, “Wait!” she looks around at her classmates and smiles, “You can't use your hands.”

The girls surrounding you giggle and you can't help but be disgusted at the idea of licking your own sperm off the ground. It's one thing to swallow a futanari’s sperm that's normal. But to swallow a boy's cum especially your own, is well, gross. But it’s clear that Sarah is past the point of reasoning with so you let out a sigh and bend down to start licking up your own load. Luckily it's at most a teaspoon of watery cum that would have only taken one good lick if it wasn’t for all the girls pointing to different spots on the ground where you supposedly “missed a spot”.

You can't do anything besides lick the floor where they point because when you looked to Sarah for help. She just raises an eyebrow that made it clear this was part of the punishment. After five minutes of you licking the floor to the amusement of Sarah’s friends the bell rang for the end of free period and it was time for Sarah to go to her next class.