NL200 - AQs deep.. NFwith paired board in a limped pot..

[RedBarracuda]

No reads other then their stats... Practically never seen them before..
I sometimes do this with AK,AQ,AJ,AT in SB and BB, and I did it now..

$1/$2 No Limit Holdem
6 players
Converted at

Profiles and Stacks:
UTG ($562.40) 39.3/11.0/2.1 (145)
UTG+1 ($117.84) 64.0/4.0/0.9 (25)
CO ($53.40) 39.1/0.0/2.7 (23)
BTN ($166.00) 14.7/11.6/2.3 (129)
Hero ($407.60) 15.5/10.2/16.0 (187)
BB ($162.45) 37.6/3.8/1.8 (237)

Pre-flop: ($3, 6 players) Hero is SB [Qh]
UTG calls $2 ($560.40), UTG+1 calls $2 ($115.84), 2 folds, Hero calls $1 ($405.60), BB checks ($160.45)

Flop: [6h][Kh] ($8, 4 players)
Hero bets $7 ($398.60), 1 fold, UTG calls $7 ($553.40), UTG+1 calls $7 ($108.84)

i got myself a NFD and I immediately started betting cause that's what I always do.. 2 callers, fine..

Turn: ($29, 3 players)
Hero bets $18 ($380.60), UTG calls $18 ($535.40), UTG+1 calls $18 ($90.84)

i hit my nut flush and now I bet an amount that I think won't fold them easily and will even make one of them bluff and raise... s+it..that doesn't happen and here comes the river..

River: ($83, 3 players)
Hero checks ($380.60), UTG bets $21.76 ($513.64), 1 fold, $21.76 to Hero ($380.6)?

now I start thinking about possible sets becoming boats and why the smallish bet, is it provoking me to raise because my hand is so obvious or is it a pure blocker?? i am unsure if I want to raise so much to lose the stack here and have only myself to blame for it because of my turn bet... but again, i want value if I raise and he will just call because this was a blocker.. or do I just call and get it over with? ... what do I do?
comments on all streets welcome..

[k3nt]

You call. Checkraising the river with a flush on a paired board is a sign of a donk ... you're only going to get looked up by boats. Especially for a double stack, a CR is a massive reverse implied odds play.

[BigPhish]

Why no raise preflop?

[Triple B]

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[RedBarracuda]