200NL: KK in tough spot multi-way pot

[Aero1441]

SB: $136.39
BB: $212.65
UTG: $200.00
UTG+1: $93.95
CO: $84.95
Hero (BTN): $195.00

Pre-Flop: K [img]/images/graemlins/diamond.gif[/img] K [img]/images/graemlins/spade.gif[/img] dealt to Hero (BTN)
UTG raises to $7.00, UTG+1 calls, CO calls, BTN raises to $33.00, SB folds, BB calls, UTG folds, UTG+1 calls, CO folds

Flop: ($114.00) 4 [img]/images/graemlins/spade.gif[/img] 3 [img]/images/graemlins/club.gif[/img] 7 [img]/images/graemlins/diamond.gif[/img] (2 Players)
BB bets $40.00, UTG+1 raises to $60.95, Hero ?

What the hell do I do here? For some reason I have a feeling that BB has Aces, what else would he coldcall here with and bet $40 on such a flop? Am I overcautious and should I just shove the flop or do I fold? Can I even fold seeing as how big the pot is already? And is my preflop raise large enough?

[pineapple888]

Just shove, if he has AA gg him. Preflop is fine.

[spivey]

Shove.

[tubasteve]

not a tough spot, STICK IT IN!

[maromb78]

I am I the only one reading this guy for a set? He flat called the first raise in bad position, then flat called the reraise. This makes me think he has a small to middle pocket pair. Because of his raise post flop I am thinking set instead of 88 or 99 etc. I am I way off line? However, I don't think you can fold. The pot is too big in this scenario.