AsTs in early position

[Gambler]

AsTs in early position. UTG limps. I raise. Two cold calls. The button re-raises. The blinds fold. Everyone calls. (16.5 sb).

Flop: A84s rainbow, but I pick up a backdoor flush draw. UTG checks. I check. One of the limpers bets. The button calls. UTG calls. I raise (although I seriously thought about just calling). Everyone calls. (13 bb).

Turn: Js. UTG checks. I bet. The limpers call. The button calls. UTG folds. (17 bb).

River: not a spade but a T giving me two pair. I bet. The limpers fold. The button raises. I call.