Rin's babysitter was like that girl in the Incredibles who watched Jack-Jack: Shockingly prepared and only a little overwhelmed when Rin lit himself on fire. 

Her name was Rachel Elizabeth and she was super cool and super sweet.

"Hey Rin, show Daddy that cool trick we learned!" Rachel said excitedly to the eight year old. The child grinned wide and lit the tip of his tail on fire. Rachel took a skewer and roasted a marshmallow over it. She made a perfect s'mores and offered it to Lightning.

He took it hesitantly and took a bite out of it. He hummed. "I don't know why I expected it to taste different, it tastes like a regular s'mores." He admitted. Rachel laughed. "I know right! Maybe it's just because we see the fire as a whole different kind of fire from regular fire for bonfires and such." She shrugged.

Lightning grinned and ruffled Rin's hair as he walked I side. "Nice job, kiddo." He complimented. Rin glowed with pride.