[NL20] (UTG vs. MP) Doublebarreling dangerous flop and hiting flush on the river.

Villain is very likely a fish, which makes all the difference here I think. Turn is actually marginal, I think you will see very very few folds from fishy villain, so maybe check.

River I like checking, villain will bet Qx and you give him the option of bluffing busted draws. You only loose money maybe to 8x type hands but it's not even a given he will call 3 times with that.

We have different options vs. a fish on the turn, fortunately:

1) Betting a usual size (like you did) with no foldequity and the chance of getting raised by Qx. The Problem is also that we can't really call a river bet if he calls, we miss and he bets.
2) Betting a small sizing to draw and give ourselves the odds (still the chance he raises us with Qx, but also calls with worse)
3) X/f - probably too weak since our hand still has decent equity vs his range
4) x/c --> Probably my most favorable option here. He can still have plenty of draws, T9 and JT so that we can still be good on the river with our Ahigh. Thus, our equity should be enough, plus it's a bit less likely we see a lot of bluffs on the river.

As played I would either overbet the river, or x/r his bet 3x or 4x dependent on his sizing for max. profit. We give him the chance to bet his busted draws, and we see a bet from Qx most of the time anyways