KK vs. a Chip Leader

[Cleveland Guy]

Right before the end of the first Hour of the Pokerroom $20 Shorthanded (6 to a table) $20 Multi.

220 entered, top 30 pay, we are about 80 left, so a bit to go before the money.

Due to a recent bustout table is 5 handed right now.

Hero gets dealt Black KK on the button. Blinds are 75/150.

Hero has 4950 Chips, BB is 2nd in chips with about 12,000.

Hero Open raises on the button for 450. SB Folds, BB Calls.

Flop comes 3 [img]/images/graemlins/club.gif[/img] 9 [img]/images/graemlins/diamond.gif[/img] T [img]/images/graemlins/diamond.gif[/img]

BB leads out for 700.

What's my move?

I have been at the table for about 15 minutes. BB built his stack up before I got there, and has been taking coin flips vs. stacks 10% of his size, but has not been out of line against the bigger stacks.