Who wouldn't?

You just shake your head, leaning into your locker to grab the Rulebook again.

"Old Rule: Female students are required to take a sexual fitness exam instead of a physical one. Male students may spectate and are expected to assist as necessary."

You just grin back at her. "Of course I am! Watching you sluts go through the sexual fitness exam is the highlight of gym class," you tease. She just shakes her head, and gives you a playful slap on the arm. "You would think that, ya perv."

The two of you file out with the rest of the class and, to your shock, your gym teacher is holding a massive, double-ended dildo. The silicone monster is a translucent purple color and it flops lewdly in her hand. "Alright! Time for the first sexual fitness exam, the Dildo Relay. You will take the test in teams of two, one team at a time. The first runner on every team will slide the dildo into her ass, and run one lap around the quarter mile track. Then, you'll transfer the dildo to your next team mate. Remember, you must insert it into your teammate before removing it from yourself, and when it's inside both of you, you can't touch it with your hands. It's a 30-second penalty every time it touches the ground. A passing score is 5 minutes."

She looks down at her clipboard, "Alright, the first team is you two," she says, pointing to Sarah and a petite Asian girl named Julie.

You notice a few of the boys surreptitiously start to rub themselves as Julie steps up to start the race. She takes the dildo from the teacher and lubes it up. She shudders, moaning obviously as she slides the thick toy into her pucker, her dark brown nipples hardening as she gets to the starting line. "Go!"

The coach clicks the stopwatch and Julie starts running. The giant purple cock flops humiliatingly behind her, and its thickness gives her gait an awkward waddle. It's clear from the look on her face that she's enjoying her run, the cock shifting inside her, stretching her hole. Eventually, she makes it back around the track, knees trembling, face flushed. She presents her ass to Sarah who turns around and pulls her leotard to the side, groaning as she shoves the head up her ass.

Slowly the two girls work towards each other, moaning lewdly as they slide back and forth on the toy, trying to **** it deeper into Sarah. Before long, Julie starts spasming, knees buckling as she groans. They give way as she drops to all fours, cumming in front of her gym class. The motion is enough to dislodge the toy from her hole, and Sarah is off and running.

Still, after all that stimulation, it's not long before she stops on the middle of the track, her body wracked by an orgasm of her own, while the boys look on from the stands and cheer.