What do I do here?? (shorthanded overpair)

[barongreenback]

Button was loose. I hadn't seen any moves from him so far. SB tighter and more passive. I'd been throwing my chips around a bit but nothing crazy.

Paradise Poker Pot-Limit Omaha High, $0.50 BB (3 handed) converter

SB ($20.25)
Hero ($45.50)
Button ($49.00)

Preflop: Hero is BB with A[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/heart.gif[/img]. SB posts a blind of $0.25.
Button calls $0.50, SB (poster) completes, <font color="#CC3333">Hero raises to $1.75</font>, Button calls $1.50, SB calls $1.50.

I don't like raising OOP but surely its right here?

Flop: ($6) 3[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets $6</font>, Button calls $6, SB folds.

I half expect to be called so the flop is the time to make a plan for the hand. I didn't have one. Still don't.

Turn: ($18) T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero ??</font>

Are overpairs like this a creditibility issue? Does he think I'll go all the way with it and is he prepared to do something about it if not.
How far should I be prepared to go?
If I do go with the hand is there a slower way of getting it to showdown?
Should I accept it's just one pair?

Thanks
James