Poster's special against an unknown's donkbet

[topspin]

This is my first hand at the table, so MP1 is an unknown. Thoughts on flop raise and turn action appreciated.

Party Poker 1/2 Hold'em (9 max, 10 handed)

Preflop: Hero is CO with T[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/spade.gif[/img]. Hero posts a blind of $1.
<font color="#666666">1 fold</font>, UTG+1 calls, UTG+2 calls, MP1 calls, <font color="#666666">1 fold</font>, MP3 calls, Hero (poster) checks, <font color="#666666">2 folds</font>, BB checks.

Flop: (6.50 SB) T[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(6 players)</font>
BB checks, UTG+1 checks, UTG+2 checks, <font color="#CC3333">MP1 bets</font>, MP3 calls, <font color="#CC3333">Hero raises</font>, BB folds, UTG+1 folds, UTG+2 folds, MP1 calls, MP3 calls.

With TPNK, on the flop I'm prepared to fold to an EP bet. With the bet coming from LP though, there's a decent chance that your average villain is firing with second pair, a small pocket pair, or even air. The 7.5BB in the pot is big enough that I don't want to give it up when I've got top pair, and my hand is pretty vulnerable to overcards, so I raise it up.

Turn: (6.25 BB) 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">MP1 bets</font>, MP3 folds, Hero ...

[b]Donk. Now what? Against any T hand I'm drawing to a split at best. Against a 6 I'm drawing to 2 outs. I'm way ahead of a pocket pair 9 or smaller or a pair of 5's which might potentially donk-bet it here.

Is this a WA/WB calldown, or a fold?