Live game have little to no read on my opponent. I open KQ off from middle position for 7 and get a call from the BB. flop comes Q68 rainbow, I continue for 10 and my opponent calls, turn is 7 of clubs bringing a flush draw, I bet 25 and my opponent calls, river is K of clubs and villain thinks for a bit and bets 90. His value range consists of 6x of clubs, some straights that he doesn't check raise turn with and KQ which is also unlikely. Do i have a profitable call here theory wise with no reads on my opponent, or does he have to turn his 97/57 hands into a bluff on this river for a call to be correct. Will post results after some feed back.