They go to the sports hall

"There, nice and quiet." Oliver said as the three of them stood in the empty hall. "Let's go over by that equipment." he led them to stacks of gymnastics equipment, including a vaulting horse and a large box for storing balls. He took his camera from his pocket.

"No photos." Robyn reminded him.

"I was just getting it out to delete the photos of your underpants." Oliver replied. "Now, let's see the girls."

Sandry and Robyn stood in front of him, and looked at each other. Sandry sighed, and unbuttoned her blouse over her white bra, Robyn did the same to reveal a pink one.

"Okay." Robyn gulped, "But you'd better keep your promise."

"Don't I always?"

"Three, two, one..."

Robyn and Sandry both lowered their bras, letting their breasts free. Sandry's large curvaceous pair, and Robyn's more modest but firm and pert ones.

"There, happy now?" Sandry asked.

"I think I am..." Oliver smiled, "Now!"

The vaulting horse and ball box popped open, two of the boys from the school paper team jumping out. They were joined by another two from hiding places behind equipment. The four of them grabbed for Robyn and Sandry's tops and bras, yanking them off, then all the boys sprinted from the room, waving their trophies, cheering and laughing.

Sandry and Robyn, topless and both with splits in their trousers, watched them go, shocked.

"What?!" Sandry exclaimed.