Raise this turn? 100PLO full ring

[Grandezza]

Reads/history:

MP1: Saw him playing a straight straightforwardly so I'm pretty sure he doesn't have a set here. Other hand he check called with something like AQJ9 on a K62 board having no flush draw. Just a limped pot but still something to think about.

SB: I saw him stabbing when checked to on the button in a 6-way raised pot with air. Just played a pot with him where I check raised aces with nut flush draw and a gutshot and lost to his raw top two pair.

Party Poker
Pot Limit Omaha Ring game
Blinds: $0.50/$1
8 players
Converter

Stack sizes:
UTG: $85.30
UTG+1: $72.27
MP1: $151.77
MP2: $106.63
Hero: $100
Button: $311.43
SB: $271.60
BB: $39.43

Pre-flop: (8 players) Hero is CO with 3[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/diamond.gif[/img]
2 folds, MP1 calls, MP2 folds, <font color="#cc0000">Hero raises to $3.5</font>, Button calls, SB calls, BB calls, MP1 calls.

Flop: 3[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/spade.gif[/img] ($17.5, 5 players)
SB checks, BB checks, MP1 checks, Hero checks, Button checks.

Turn: J[img]/images/graemlins/club.gif[/img] ($17.5, 5 players)
<font color="#cc0000">SB bets $12</font>, BB folds, MP1 calls, Hero?

I'm pretty sure that sb could just be stabbing here and don't think MP1 has much but they may call with weak hands thinking I'm tilted.