In some stories Raph is jealous and competes for a girl's affections. Here, Raph is just enjoying Leo being so uncharacteristically enamored that he does slightly mindless things. Raph likes to make fun of his brother, and what better opportunity than when Leo's drooling over Roxy? Plus Raph probably likes busty blondes; Rox has a willowy figure (even if she wasn't recovering from malnutrition) and brunette hair with auburn tints.
In the shadows of the second floor of the lair, two emerald eyes gleamed. Peering down into the main room, a bat-winged, lizard-tailed creature crouched behind one of the supporting pillars. The creature slinked forward, eyes on her intended prey. A red-banded turtle was strolling from the front door to the kitchen, box of pizza in hand. He hummed to himself, completely unaware of the imminent danger. Soundlessly, the predator crouched at the edge of her balcony and spread her wings. With a mighty thrust of her legs, she glided quickly towards the unfortunate turtle. She landed perfectly on his shell with enough force to make him stumble. Snatching a slice of pizza with a victorious cry, she leapt off the now furious turtle and scampered off on all fours, pilfered slice half stuffed in her mouth. He gave chase but she scaled a pillar with the aid of her clawed wings and prehensile tail far faster than he could hope to catch.
"ROXY!" Raph roared. Her giggles echoed eerily back to him. He sighed. No use now. The pizza was gone as sure as if it was Mikey that had stolen it. He picked up what was left of the pizza and deposited it on the kitchen table.
"Rox get you again?" Don asked as he leisurely strolled into the room.
"You have to ask? She nearly knocked me flat!"
Roxanne had been living with them for a month now. She had gotten strong and healthy quite quickly after her wings and tail had emerged, and she was now almost as rambunctious as Mikey. Other mutations had shown up after the new appendages as well. Her nails on both her hands and feet were long and sharp. Her canine teeth had elongated and sharpened as well. The final mutation was her eyes: they were now slit pupiled like a cat's and reflected light. She had also reported being able to see in almost complete darkness.
She trained with Master Splinter just as much as the brothers did, some days more. He liked to show her little things she could do with her tail that he was never able to teach to his sons. Her dexterity with it never ceased to astound Mikey, who could be fascinated by it for long periods of time. Klunk, Mike's cat, liked to pounce on it. Don was mildly awed, and Raph really didn't care, as long as she didn't choke him with it like she sometimes threatened to. Leo had mixed feelings. On the one hand he liked that she was getting stronger and could protect herself. On the other, the tail added allure to her rear for him; and she liked to wrap the end of it around his ankle when they were near enough to. She didn't do that with anyone else; just him.
Mike bounded into the kitchen. "Dude! How come Roxy already has a slice?" he squawked indignantly.
"Because she ambushed Raph again," Don explained. Mike chuckled, metaphorical ruffled feathers forgotten.
Raph wasn't the only one to get ambushed. Don was smart enough that after the first time it happened, he would scan the balconies before crossing the main room. Staying under the balconies usually prevented her from attacking, and she would let you go and wait for easier prey.
Mikey was just as fanatical about food as she was. He kept a death grip on it, and had fast enough reflexes he could catch her before she could scamper away. They had a great time playing tag once she mastered gliding.
Leo just let her. She often rode into the kitchen on his shell, eating whatever food item she had pilfered from him. He was often accused of spoiling her. She never pounced on Master Splinter, though she would land quite suddenly behind him.
Once introduced to Casey and April, they were not left out of her game. April glared every time she landed behind her, so she didn't "play" with April often. It was odd, as the two women usually got along wonderfully. Casey was given the benefit of the sound of whooshing air instead of her usual silent approach. He needed time to brace his back so she didn't hurt him; he didn't have a shell to protect him from her impact. He reacted as Raph usually did: trying to catch her, failing, and yelling.
Leo suddenly appeared in the kitchen. "Did Rox ambush Raph again? She was sitting on a balcony with her cheeks full of pizza, looking very smug." Mikey outright laughed as Don chuckled and Raph harrumphed.
Looking to change subject, Raph said, "So…patrol tonight?"
"I'm all for it. How about you guys?" Leo asked the younger two. Don and Mikey nodded agreeably.
Leo started a little when he felt a warm, scaly tail wrap around his ankle. He looked confusedly at Roxy, who had appeared seemingly out of nowhere. Her grip was way tighter than usual. Her worried green eyes bored into his own, and he couldn't help but feel suddenly very apprehensive about tonight.