Flitter ran through the lush grass, a hoofball gripped firmly with one wing. She would not, under any circumstances, let Cloudchaser get the ball.
She tossed it up, pumping her wings and catching it in her tail as she flew just above Cloudy. Cloudchaser was quick to fly after her, dodging and weaving through the clouds Flitter kicked in her path. Fillydelphia must have heard them screaming and whooping, it was that loud of a racket.
Eventually Cloud tackled Flitter, knocking the ball from her grasp. They lay on top of each other, panting, for a few moments, before Cloudchaser made a desperate lunge for the old thing, the two rolling and shoving each other before Cloud grabbed it and flew off. Flitter dashed after her, this time with the roles reversed. They kept at it until Cloud dropped the ball.
Then they weren't just playing Keep Away. They were playing The Hunger Games.
Both of them dove and looped and whirled through the air in a chaotic frenzy that spooked every squirrel in their right mind out of their trees. They both crashed into things and ponies multiple times, but nothing could stop them in their quest to retrieve the ball.
Then the ball fell into one of AJ's apple trees, where Rainbow Dash happened to be sleeping. The hoofball landed neatly on Rainbow's stomach, waking her up to two expectant, sweaty mares.
Rainbow grinned. She was familiar with Flitter and Cloudchaser's games.
"Not a chance." She flew off with the hoofball in her grasp.
It was a chase of the century, all three parties making their best efforts to obtain the legendary ready-to-be-put-out-of-its-misery hoofball. All three crashed into clouds at points, and different ponies had control. Various eyewitnesses have different accounts, including just saying 'the horror' over and over, but the general consensus is that Discord would be proud.
Eventually they all crashed into a cherry blossom tree, petals raining down on them. They were all piles of giggles, Rainbow lounging in the branches. Flitter pulled Cloudchaser in for a hug.
"I love you, sis." Flitter brushed a few petals out of Cloud's mane.
"I love you, too."