"COME BACK HERE, SISTER!"

Celestia laughed as she took one of the turns at full speed, leaning dangerously into the turn. Her breasts bounced and jiggled as her feet pounded the pavement, straining the gold fabric of her bikini.

Luna pelted after her, arms spread out behind her in an absurd ninja airplane run, body low to the ground; the cut of her black bikini combined with the force of gravity did interesting things to her chest, and the spectators closest to her got an impressive look at her firm cornflower blue ass and supple thighs. Fast as she was running, she was several feet behind Celestia, who was gaining on her, her impossibly long legs giving her the advantage.

Celestia chanced a look back to taunt her sister. "You never could catch me, Luna! When we were kids, you always sucked at playing tag!"

She turned around just in time to see a mulberry blur shoot out in front of her and drop low to the ground. Then, her right leg was yanked out from under her, and she went flying, arms flailing as she bounced painfully down the street on her front.

"HAHA!" Luna cried. "What were you saying, Celie?"

Celestia pushed herself to her knees, grimacing at the loose gravel that had scratched up her smooth, flawless skin. "I was saying..." She glared at Cheerilee, who had come out of nowhere and deliberately tripped her, and was going for her bikini top, "...that I'm going to lock Cheerilee in a broom closet with Apple Bloom, Sweetie Belle, and Scootaloo for a week."

Cheerilee paled.

Celestia smirked, reached out, and ripped off Cheerilee's green bikini top, then sprang to her feet and took off running again.

Rainbow Dash stood in the designated "green area" for disqualified contestants, watching as a trickle of topless girls and teachers returned to the start line. Most of the returnees were glaring death at Flim and Flam; all were still topless, with many trying in vain to cover their bare chests with their hands or hiding behind objects or other girls. Since the girls were all eye candy, naturally they hadn't been offered shirts or towels or allowed to change clothes...they were all expected to stand around topless until the end of the marathon.

For her part, Rainbow had decided she didn't really mind showing off her chest. She didn't have the biggest tits at CHS, but she liked her tits, and judging by the applause she'd received on the way back to the start line, so did a lot of the guys at school. So while others had hidden, covered up as best they could, or acted all bitchy about the whole thing, Rainbow wandered around, chatting up everybody she knew, breasts on proud display. She'd even allowed herself to be groped a couple of times.

When Applejack and Ms. Harshwhinny returned, arm in arm, she grinned evilly. Like everybody else, she'd seen it on the big video board at the start area: Applejack and Ms. Harshwhinny suddenly, inexplicably making out with each other in the middle of the street. She ambled over to them, breasts bobbling, and waved.

"So, AJ," she said. "You and Harshwhinny. What's up with that?"

Applejack blushed. "Ah...dunno whut came over me," she said, looking over at where the teacher was verbally haranguing the two promoters. "It jes'...an' then..."

"It's just...if you're into chicks, couldn't you, y'know...do better than that?"

"What, you mean like you?" Applejack asked, raising an eyebrow.

Rainbow snorted. "Please. I'm way outta your league. Besides, not gay." She glanced past Applejack and caught sight of Soarin, a senior she'd always admired, lurking at the cordon at the edge of the courtyard, near the statue with the portal to Equestria. "Speaking of not being gay...excuse me," she said. She wandered over to Soarin, swaying her hips. "Hey, Soarin!"

Soarin blinked, a blush creeping over his face. "Uhh...hey, Rainbow Dash," he said.

She gave her modest breasts a perky bounce. "See anything you like?" she teased.

"Uhh..." Soarin's face turned even redder as he tried not to obviously stare at Rainbow's chest.

Rainbow snorted. "Dude. Don't even. You wouldn't be here if you didn't wanna see boobs." She smirked. "As long as I have your attention..."

Rainbow crouched down in front of Soarin, unzipping his pants. He cried out in surprise and alarm. All around him, guys whooped and cheered.

"Rainbow Dash? What are you...ooooh..."

Luna snarled and put on a burst of speed as Celestia rounded a corner, disappearing from view. "You're not getting away from me, Celie!"

As Luna rounded the corner, a gold-and-white blur slammed into her, knocking her flat on her ass.

Celestia straddled her, smirking; her chest heaved. "When are you ever going to learn, Luna?" she asked as she slipped her hands underneath Luna and unfastened her top, pulling it away and tying it around her wrist. She grinned as she playfully cupped Luna's breast, tweaking her nipple. "You'll never eclipse me. Ever." She stood up, winking at her sister, then took off running again.

Luna stood up, face furiously dark with an outraged, humiliated blush. "CELESTIA, I SWEAR WHEN WE GET HOME, I'M PULLING OUT THE STRAP-ON! I'LL WORK YOUR ASS OVER UNTIL IT'S PURPLE! THEN I'LL PUT IT ON EWETUBE!"

All around her, hoots, whistles, and catcalls erupted. She glared at the various men and teenage boys ogling and cheering her. "OH, SHUT UP!" she cried, stomping a foot angrily. With a frustrated sigh, she turned and trudged back to the school.

Celestia chuckled to herself as she picked up the pace, Luna's frustrated yowls ringing behind her. "She's always been such a sore loser..."

A sudden sharp pain shot through her left ankle, and she nearly fell to the ground. Drawing in a sharp hiss of air, she stopped running and knelt down, clutching her ankle. She took off her shoe and sock and rubbed her ankle, probing it; nothing felt broken or even sprained, and the pain was already lessening.

"Oh my...are you alright, Principal Celestia?"

Celestia looked up as Fluttershy jogged to a halt next to her, leaning down. She was surprised to note that the shy, unassuming junior had over half a dozen bikini tops tied around her wrist. She grimaced. "I think I just stepped on it wrong," she said. "I think I'll be okay in a minute." She stood, gingerly putting her weight on her left leg. She hissed as a dull needle of pain stabbed through her foot and calf. "Maybe...not," she said.

"Goodness," Fluttershy said, eyes full of concern. "You should probably get that looked at." She looked around at the spectators. "Umm...excuse me...could somebody please see about getting Principal Celestia a medic?"

A dozen phones came out—not to take pictures for once, but to call for help.

"Thank you, Fluttershy," Celestia said, sitting down in the middle of the street.

"I hope you feel better soon," Fluttershy said. "Oh, and..." She reached down and stripped off Celestia's top in one smooth motion. "Sorry, but...I kind of really want to win...please don't be too mad at me..."

Celestia laughed. "Good luck, Fluttershy," she said.

Fluttershy took off running, and Celestia sighed, smiling sheepishly at the crowd of onlookers as she sat in the middle of the street with an injured ankle, her breasts shining in the sun.