50NL AK flops TPTK + royal draw and I play scared

[Hail Eris]

Is this standard or too weak tight? Villain is a passive donk who open limps with strong hands. I figured a lot of his range consisted of hands cotaining the Q/images/graemlins/diamond.gif.

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) Hand History Converter Tool (http://poker-tools.flopturnriver.com/Hand-Converter.php) from FlopTurnRiver.com (http://www.flopturnriver.com) (Format: 2+2 Forums)

SB ($39.25)
BB ($43.95)
UTG ($31)
MP ($42.60)
Hero ($118.80)
Button ($53.15)

Preflop: Hero is CO with K/images/graemlins/diamond.gif, A/images/graemlins/spade.gif.
<font color="#666666">1 fold</font>, MP calls $0.50, <font color="#CC3333">Hero raises to $2.5</font>, <font color="#666666">3 folds</font>, MP calls $2.

Flop: ($5.75) T/images/graemlins/diamond.gif, J/images/graemlins/diamond.gif, A/images/graemlins/diamond.gif <font color="#0000FF">(2 players)</font>
MP checks, <font color="#CC3333">Hero bets $4.5</font>, MP calls $4.50.

Turn: ($14.75) K/images/graemlins/heart.gif <font color="#0000FF">(2 players)</font>
MP checks, Hero checks.

River: ($14.75) 3/images/graemlins/spade.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">MP bets $8.5</font>, Hero calls $8.50.

Final Pot: $31.75

[BigBadBabar]

bet turn, i'd bet 12-14 and be happy to get it all in if he raises back. we have tons of outs if behind, and i doubt we are usually.