100NL KKs with 2 callers and a tough turn decision

[SimaoMacaco]

This is full ring table with 3 empty seats so there are just 6 players. Button is kinda LAGgy, no reads on others. I am on a 2 buyin downswing at the moment with cards forcing me to play and then lose. The flop seemed kinda harmless to draws so i wanted to encourage play from weaker hands and save a bit against a flopped set, hence the small flop bet.

UTG $96
UTG+1 empty seat
MP 46.18
MP+1 empty seat
LP empty seat
CO Hero 98.22 (K[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/spade.gif[/img])
Button 42.07
SB $15
BB $45

<font color="#666666">1 fold</font>, <font color="red">MP raises to $1.5</font>, <font color="#666666">1 fold</font>, <font color="red">Hero raises to $4.5</font>, <font color="blue">Button calls $4.5</font>, <font color="#666666">2 folds</font>, <font color="blue">MP calls $4.5</font>

Flop
pot = 14.25
9[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/spade.gif[/img]
check, <font color="red">Hero bets 7</font>, <font color="blue">Button calls 7</font>, <font color="#666666">MP folds</font>

pot = 28.25
Turn [9[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/heart.gif[/img]]
Hero checks, <font color="red">SB bets $30</font>, Hero ??

Hero thinks ahhhh crap... now what??

I play at Tribeca Tables and cannot find a convertor so this is all done by hand, maybe a few errors
[img]/images/graemlins/wink.gif[/img]