QQ with a As flop, right line ?

[Raven]

Party Poker No-Limit Hold'em, 2$ BB (6 max, 6 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

UTG ($154.89)
MP ($206)
Hero ($141.98)
Button ($89)
SB ($119)
BB ($66.05)

Preflop: Hero is CO with Q/images/graemlins/club.gif, Q/images/graemlins/diamond.gif. SB posts a blind of $1.
<font color="#666666">1 fold</font>, <font color="#CC3333">MP raises to $4</font>, <font color="#CC3333">Hero raises to $12</font>, <font color="#666666">3 folds</font>, MP calls $8.

Flop: ($27) T/images/graemlins/spade.gif, 7/images/graemlins/club.gif, A/images/graemlins/diamond.gif <font color="#0000FF">(2 players)</font>
MP checks, Hero checks.

Turn: ($27) J/images/graemlins/diamond.gif <font color="#0000FF">(2 players)</font>
MP checks, <font color="#CC3333">Hero bets $15</font>, MP calls $15.

River: ($57) 5/images/graemlins/club.gif <font color="#0000FF">(2 players)</font>
MP checks, <font color="#CC3333">Hero bets $20</font>

The player against me is a loose aggressive player.

[soah]

Don't reraise preflop. You want the LAG to continue betting into you when you get a safe board. Now you are the one that is stuck bluffing at the pot. Betting the river is very -EV unless your opponent happens to be a huge calling station as well as a huge LAG. You've identified that your opponent bets and raises too much but your plan for the hand fails to take advantage of his weakness. You've put your opponent into a situation where it's almost impossible for him to make a mistake.

[Raven]

If I bet the flop I put him in a situation where he cant make a mistake. I just checked it, so he think I dont have an Ace and he will often call me down with a pair of T or J. I look like Im bluffing on the turn. On the river with his timid call and his third check of the hand I just cant put him on an Ace, and I tought he would call me again with a middle pair.

[TheWorstPlayer]

He raised preflop. I think it is much more likely that he has an A here than that he doesn't.