Good Draw out of position against weak pair

[Atropos]

Party Poker No-Limit Hold'em, $ BB (6 max, 5 handed) converter

BB ($100.5)
UTG ($7.5)
MP ($204.76)
Button ($164.37)
Hero ($157.7)

Preflop: Hero is SB with A[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/heart.gif[/img]. Hero posts a blind of $0.5.
<font color="#666666">1 fold</font>, <font color="#CC3333">MP raises to $3</font>, Button calls $3, Hero (poster) calls $2.50, BB calls $2.

Flop: ($12) 4[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, BB checks, MP checks, <font color="#CC3333">Button bets $8</font>, Hero calls $8, BB folds, MP folds.

Turn: ($28) Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets $8</font>, Hero calls $8.

River: ($44) 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets $8</font>, Hero folds.

Final Pot: $52

His turn bet means: "I got a weak pair or worse, if you raise me I probably call the turn and at the river you are in for a tough decision whether to bluff all-in, because I'm an idiot and might even call your river all-in though I only have a sucky pair that you could not beat"

What to do? Raise the turn? How much? I know I did not play this ok, good draw against weakness must be +EV even if I miss.