weird river

[brettbrettr]

.50/1.00 ring game (no reads other than the typical not very good players are sitting with me ones), I have Ac10c in LP.

5 limpers, I raise, blinds fold, limpers call.

flop comes Qh 9s 2c.

check to MP player who bets, CO calls, I call. Rest fold. (questionable call? its a big pot, but I might be drawing to 3 clean outs here, plus the backdoor flush.....)

Turn: Ad.

Bet, call, I raise, both call.

River: 6s.

MP bets, CO raises(?).....

Your play?