KK, 3bet pot vs laggerson, line check

[HoldEmNewby]

Villain was a loose aggressive type maybe 37/20 type. He was aggressive but this is the first 3bet pot we've played. Against a Tag I think flop check is pretty standard, I don't know if it was the right play on my part. Turn against a Tag I'd bet small to get called lightly and maybe get him to push, but he was a Lag so i figured i should bet strong here and he'd probably still call me lightly.

Party Poker - No Limit Hold'em Cash Game - $0.50/$1 Blinds - 4 Players - (LegoPoker Hand History Converter)

SB: $171.88
BB: $160.20
Hero (UTG): $98.50
BTN: $126.83

Preflop: Hero is dealt K[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/heart.gif[/img] (4 Players)
<font color="red">Hero raises to $4.00</font>, BTN folds, <font color="red">SB raises to $7.00</font>, BB folds, <font color="red">Hero raises to $21.00</font>, SB calls $14.00

Flop: ($43) 2[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/club.gif[/img] (2 Players)
SB checks, Hero checks

Turn: ($43) 4[img]/images/graemlins/heart.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $33.00</font>, <font color="red">SB pushes</font>, Hero calls $44.50 and is all-in