[breathweapon]

It's based on a couple factors,

1) You have a pair
2) Your opponent doesn't hit a pair 2/3 of the time.
3) Your opponents range from UTG 4 handed is at it's worse 2 Face Cards unsuited, AX suited or perhaps Face/8s. Giving credit for the 9-8 range is rough, because it's either A/9-8s, A/9-8, K-T/9-8s, K-T/9-8 and most people tend to avoid cards with 9-8 unsuited.

Villain's re-raise is fine, but after the call, he should have put an Ace in your range and folded instead of bluffing the Ace, set, draw or whatever he was thinking, because Ace high with a draw or another PP is the least you could call that with.

On an A-Q board, it's a bad idea to re-raise with PP, on a J-2 board, re-raising with a PP is standard to take advantage of CBets from Ak, AQ, KQ etc.

OP, Cbetting and even double barreling on an A-Q board or a J-2 board can be a good idea, most people will have to drop their PP, draws or middle/low pairs to that much aggression, and most people will let you know when they have an A-Q immediately. I've even seen/made people drop A-Q with weak kickers to that much aggression.

It's really about reading the board, the opponent and the position. Theoretically, you may as well have any 2 cards when you try to do this, but at show down you'll always have a hand, even if it isn't the best hand, and if you pick up a set at some point, GG Villain.

Semi-Bluffing A high and PP across one or more streets are common LAGG lines. You either have more than your opponent does more often than not, if your opponent does have more than you do, he may have to lay it down, and if your opponent has a big hand, he's going to show it to you.