SB offense

So the game is Party 1/2 short and I've been playing my ussual tight solid game. This hand came up around 40 hands in.

BB is 40/5/1 and Button is 60/5/1.

Button limps, I raise As9c, BB calls, and Button calls.

Flop comes brick brick brick, or 727 w/ two spades, I bet, call, call.

Turn is the 4c I bet.....