99 with all undercards and paired board - Call down?

[Axel F.]

Hey, I've been reading the forums here for several months and have finally decided to register and start posting. Anyway, hoping to get some advice on this hand. Raised the 99 pre-flop to steal the button, and MP1 has just sat down, so sadly no read on him. I'm using PT with Gametime, and UTG has high VP with low aggression. I hadn't seen him do much other than call and fold. MP1's sudden decision to bet into me on the turn is scary, and the pot is not that big, so not I'm not sure whether or not I want to call this down or not. Thanks for the help.

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

Preflop: Hero is CO with 9[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/spade.gif[/img].
UTG calls, <font color="#666666">1 fold</font>, MP1 calls, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">2 folds</font>, BB calls, UTG calls, MP1 calls.

Flop: (8.50 SB) 8[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, UTG checks, MP1 checks, <font color="#CC3333">Hero bets</font>, BB folds, UTG calls, MP1 calls.

Turn: (5.75 BB) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, <font color="#CC3333">MP1 bets</font>, Hero calls, UTG calls.

River: (8.75 BB) 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, <font color="#CC3333">MP1 bets</font>, Hero calls, UTG folds.

Final Pot: 10.75 BB