25nl- Tpwk, do I raise this turn against utg limper?

[bingrich]

villain 28/11/3.6 36 hands

Poker Stars, $0.10/$0.25 NL Hold'em Cash Game, 5 Players
LegoPoker Hand History Converter

BB: $9.75
UTG: $26.70
CO: $22.80
Hero (BTN): $27.75
SB: $28.50

Pre-Flop: 6[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/club.gif[/img] dealt to Hero (BTN)
UTG calls $0.25, CO folds, <font color="red">Hero raises to $1.25</font>, SB folds, BB calls $1, UTG calls $1

Flop: ($3.85) A[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/diamond.gif[/img] (3 Players)
BB checks, <font color="red">UTG bets $1</font>, <font color="red">Hero raises to $3.50</font>, BB folds, UTG calls $2.50

Turn: ($10.85) T[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">UTG bets $1.50</font>, Hero ?

With his weak flop donk/call, and again weak donk on turn, should I be raising here on two straight streets w/ a decent but vulnerable hand in position? Does villain's line scream fd and therefore I should raise an idiot trying to set his own drawing price? Or should I call, not wanting to bloat the pot even more than it is and force out the hands I have beat? But if I call I'll have a tough decision on the river depending on villain's bet size. Call or raise?