Hufflepuffs already get a lot of Kee's love, and Quidditch along with it is even better!
I think Kee and Mel would probably have gotten along great before the great Potter schism, but right now Kee's pretty upset with every single Gryffindor just on principle. That's too bad though because I bet they'd be great friends otherwise.
Lee can go suck an egg, on the other hand.
I don't know that Kee would know Yakov all that well, or be interested in him at all.