Same live game, maybe a half hour after the first hand.

5 limpers, I call OTB with [6h][4c][2c], SB raises to $6. He tends to play pretty loose when he's stuck and likes making these pot building raises in multi-way Omaha hands. BB folds, 3 calls and I call.

Flop ($36) [3d][5d]

SB with $260 checks, UTG with $300 bets $12, UTG+1 with $120 makes it $40, fold, and it's to me.

If SB blind really had a hand he would have connected with this flop and almost certainly would have lead out. I don't think he has a hand and a check raise from him is unlikely.
UTG is BB from the first hand. He is more likely to have a made hand than a big draw, so his range leans more towards a set or the wheel than a wrap/2pair/flush draw hand.
UTG+1 is a new player, Omaha novice, and I have no idea what he can have. He is getting short and could be looking to get his chips into a big pot.

I have the table covered, what's the best way to play this?