She was the same height as him when they met. He didn't need to look up or down to stare into her eyes. So even though he was much bulkier than her they were vertically equal. That was when they were 16.
Slowly but surely Raph got taller. He first noticed when they were scoping out an old factory and he had to duck his head under a decaying beam after Cristen has walked straight through.
When they were 17 he could rest his head on hers if he lifted his chin up a little and she ducked down. Now when they argued she had to stand on her tiptoes to feel like she made her point.
When they were 18 they took a break, and Raph couldn't stand close enough to her to check their height without his heart hurting so he didn't. But he did know that the punk that put his hands on her was taller than him which didn't make kicking his ass any less satisfying. She hugged him after and she didn't have to duck anymore.
When they were 19 she was gone for 6 months. He and his brothers all grew and he himself had outgrown Leo. Casey, however, had kept his place half a head above him, and that's who he was with when he stepped into the lair the day she came back. She seemed smaller than he remembered. He wondered how he'd never broken her. Then he remembered that she took out a hundred kraang with the power of her raw emotions and dismissed that thought. His arms wrapped around her back and held her to his chest. A tear rolled down his plastron and he moved his thumbs to tilt up her head and wipe her cheeks. He had to bend down to meet her lips. She jumped up and Raph didn't budge as her strong legs wrapped around his shell. He stared into her eyes and she kissed him.
Sorry this is short. Please message or comment prompts or ideas. It could be a word or a whole scenario. Thank you for reading!
XOXOXOXO