10/20 AA hand vs teacup

[JMa]

7 handed PL on party. Eff. stack is $2k

teacup limps, I pot it ($90). Somebody calls, blinds folds, teaup calls.

Flop is K65r. I pot it $297, caller folds tea calls.

turn is a 5 and puts a 2 flush on board. He checks I bet $600 into the $900 pot, planning to put the rest in on the river if no K/6 hits. He calls.

River is an off-suit 9. He pushes. I get 3-1. Call, fold?