How bad did I misplay my set here

[frostbrn]

Pokerstars 20+1 WCOOP Test tourney. Villain has been VERY LAG so far, limping almost every hand and calling people down with middle/bottom pair.

PokerStars No-Limit Hold'em Tourney, Big Blind is t30 (9 handed) converter

MP3 (t5840)
CO (t3600)
Button (t8960)
Hero (t4140)
BB (t5875)
UTG (t17060)
UTG+1 (t4545)
MP1 (t12580)
MP2 (t7105)

Preflop: Hero is SB with 7[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, MP1 calls t30, <font color="#666666">2 folds</font>, CO calls t30, <font color="#666666">1 fold</font>, Hero completes, BB checks.

Flop: (t120) K[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, BB checks, MP1 checks, CO checks.

Turn: (t120) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets t210</font>, BB folds, <font color="#CC3333">MP1 raises to t420</font>, CO folds, <font color="#CC3333">Hero raises to t1140</font>, MP1 calls t720.

River: (t2400) Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets t1020</font>, <font color="#CC3333">MP1 raises to t2040</font>, <font color="#CC3333">Hero ???????


Was the check on the flop a total donk move with the flush draw on board? In such early position I was hoping for any bet behind me then a pretty hefty reraise. By the time I get to the river, what am I likely up against? My instinct the whole way was two pair, MAYBE set over set with his minraise on the river. Comments are always appreciated [img]/images/graemlins/smile.gif[/img]