There's honestly so much fluff that I can't keep track of it all, Gen. That's how FLUFF we make shit lmao. 

Genkai being a mother figure to Yukina? Aww! Yusuke could use her presence. Genkai's his mentor but sometimes she really does tick him off and he'll need a soothing presence after one of her rantings about how much of a dimwit he is or something xP uh, you remember the little Yusuke and Genkai thing we talked about a while back? Did we want Genkai to be young as a reward for her good deeds, and for the Yusuke thing to happen?