Oh the stories I could tell! For example, she's a genius with numbers (she's an engineer) but I suck at math. There is a reason that throughout school I never did my math homework, but I always aced the tests. Spoiler: she took them for me (our handwriting is nearly indistinguishable). In exchange I usually took PE for her, or wrote essays she couldn't be arsed with. Recently one of our new neighbors legit thought we were just one person who changed clothes throughout the day (and occasionally walked with a cane). The day she saw us together she freaked out.
That would be hilarious. Poor kid, caught in the middle while they bicker over him. I bet that dynamic always falls into play whenever the two of them is with a third person. Imagine them getting roped into taking Nao to the Chocobo Farm! Bickering but playing nice because kids~ XD
I ♥ Kotetsu. Oh, yes, Reno must walk in for extra embarrassment points. "And a threesome?!?! I really misjudged you!"