Rei's red heels clicked on the pavement as she chased the familiar down the street. It was a great pulsating shape of energy, decorated with stars that looked scribbled by children. It darted left into an alleyway, and she followed it, a smirk appearing on her face. She had it cornered.
She didn't know why the monsters were always attacking Usagi, her personal nuisance and sometimes friend. Kyubey said it had something to do with potential, but she'd growled at him to shut up as she made her excuses and left the gaggle of school girls to follow a beast that only she could see. She'd contracted in the first place to protect her. Like hell she'd let Usagi become a magical girl. She'd only mess it up somehow.
The familiar roiled and bubbled at the end of the alleyway, trapped between a brick wall and a dumpster, and Rei raised two fingers, a rippling flame twisting between them and becoming a slip of paper. Before she could act, a V-shaped light split the air between her and the creature. It shimmered and widened into a heart, then opened up like an eye. Rei realized what was happening.
"Oh no you don't," she murmured, diving sideways to get a clear shot and flinging the paper so that it trapped the familiar. This was her territory, and the familiar was her prey.
A figure appeared in the light, a mask on her face and a bow in her hair. She struck a pose. "Never fear, I'm here to save you," she giggled, and golden chains snaked up Rei's legs, binding her in place.
"No!" Rei snarled, fighting them and bringing her hands together so her fingertips made a shape like a gun, but before she could burn the familiar alive the chains climbed higher and pulled her arms above her head, candlelight flames guttering out at the tips of her fingers.
The masked Puella Magi winked at her, and Rei almost cried out again, this time because the familiar had finally worked its way free from her binding paper and was coming for the stranger. Without her having to warn her, however, the masked girl spun and kicked it, sending it flying against the far wall. She reached out and drew a shining sword from midair, the gems along the hilt winking in the moonlight.
Before Rei could really blink, she cut the familiar in half. The blonde girl laughed. "How was that?" she asked, spinning on the spot. Her hair whisked against Rei's cheek, then she blew her a kiss. With the motion, the chains dissolved and Rei staggered to keep her footing.
When she was steady, her head snapped up, and she opened her mouth to give that girl a piece of her mind. But the masked Puella Magi had vanished. Rei raised her hand to touch her cheek, where the girl's hair had lashed against it, and the spot burned her like fire never had.