Nut flush with paired board--- 100 max

[jc1418]

Hero--CO AsKs $100
Button--Villain $100
SB $75

All folds to Hero, raise pf to 3, btn and sb call

Flop: KcQh8s pot (10)
sb checks, hero bets 7, btn calls, sb folds

Turn: Qs pot(24)
Hero bets 15, btn calls

River: 2s pot (54)
Hero bets $20, btn all in for 75, so 55 more
Hero calls

does villain play a full house like this? no real reads on him, he just sat down a few hands ago. If you don't think this is a full house, what is a different line that is sometimes a full house?