Trapping w/ Middle Set (Good or Bad?)

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Been playing for a couple hours. MP1 is aggressive and loose, MP2 is also very loose but leans more toward the calling side unless you give up the lead.

UltimateBet 2/4 Hold'em (10 handed)

Preflop: Hero is BB with 9 [img]/images/graemlins/club.gif[/img], 9 [img]/images/graemlins/diamond.gif[/img].
3 folds, MP1 raises to $4, MP2 calls, 3 folds, SB folds
Hero calls.

Flop: (6.5 SB) K [img]/images/graemlins/diamond.gif[/img], 9 [img]/images/graemlins/spade.gif[/img], 3 [img]/images/graemlins/spade.gif[/img] (3 players)
Hero checks, MP1 bets, MP2 calls, Hero calls.

Turn: (4.75 BB) 5 [img]/images/graemlins/heart.gif[/img] (3 players)
Hero checks, MP1 bets, MP2 calls, Hero raises, MP1 re-raises, MP2 calls, Hero caps, MP1 calls, MP2 calls.

River: (16.75 BB) 2 [img]/images/graemlins/club.gif[/img] (3 players)
Hero bets, MP1 calls, MP2 mucks.

MP1 had A [img]/images/graemlins/diamond.gif[/img] K [img]/images/graemlins/heart.gif[/img], MP2 probably had the spade draw.

I knew MP1 was going to be betting if he had anything. This is why I decided to trap on the flop and C/R the turn.

Was it too dangerous to play it this way with the flush draw? I think it ended up being a pretty profitable way to play it. Thoughts anyone?

Final Pot: 18.75 BB