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UTG is unknown, MP is a little donkish, 37/2/0.6, been passive mostly but I snapped off a river bluff from him a few hands ago. FWIW, I could tell he had the "raise any" button checked on the river.
Party Poker 1/2 Hold'em (6 max, 5 handed)
FTR converter on zerodivide.cx
Preflop: Hero is Button with 2[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/club.gif[/img].
UTG calls, MP calls, Hero calls, <font color="#666666">
1 fold</font>, BB checks.
Flop: (4.50 SB) K[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, UTG checks, MP checks, Hero checks.
Turn: (2.25 BB) 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, UTG checks, MP checks, Hero checks.
River: (2.25 BB) 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, <font color="#CC3333">UTG bets</font>, <font color="#CC3333">MP raises</font>, Hero uhhhhhh....
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Call. I think you want overcalls in this situation. Calling gets you an extra-bet from UTG, whereas i think 3-betting gives you an extra-bet from MP only.
I think when you 3-bet and it's capped backed to you you're good <30% of the time.
Weird hand, interesting situation.
edit: sorry i didn't notice the 3-flush that came through. folding is fine.