What is your line after this guy's stop & go?

[KSOT]

I had just joined the table so no reads yet.

Party Poker 2/4 Hold'em (8 handed) converter

Preflop: Hero is MP2 with 8[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, UTG+1 calls, MP1 calls, Hero calls, CO calls, <font color="#666666">1 fold</font>, SB completes, BB checks.

Flop: (6 SB) 3[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(6 players)</font>
SB checks, BB checks, <font color="#CC3333">UTG+1 bets</font>, MP1 folds, <font color="#CC3333">Hero raises</font>, CO calls, SB calls, BB folds, UTG+1 calls.

Turn: (7 BB) 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">SB bets</font>, UTG+1 calls, Hero...?

Don't like the club much, but I clearly can't fold this turn. Do you call or raise here and then what on the river?