set of 44's,

1/3 nl

Two very loose players limp, I over limp in the CO with 4d4h, folded to the BB who raises too 20, limper one calls, limper two folds, I call. I am the effective stack with 400. The BB has been very loose with calls and pre flop raises. His OOP raises did seem to be strong. This has only been an hour worth of play.

(60 in pot}. 4c2dAc....BB checks, limper checks, I bet 45, BB calls, limper folds.

(150 in pot) 4c2dAcQc....BB checks...How do I proceed?