I have seen villain re-raise preflop more than a few times... using position to gain the aggressor status in the hand. Villain's range here is quite wide, I have also seen him re-pop people who lead out after he had raised preflop.
PokerStars No-Limit Hold'em, $1.00 BB (6 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: FCP)

CO ($131.05)
Button ($128)
Hero ($112.40)
BB ($100)
UTG ($86.85)
MP ($144)

Preflop: Hero is SB with K , J .
3 folds, Button raises to $4, Hero calls $3.50, 1 fold.

Flop: ($9) 9 , T , 7 (2 players)
Hero bets $5, Button raises to $20, Hero raises to $108.4

1. Do you like this line, and is it believable to villain/enough to get him to fold better hands?
2. Merry Christmas.

p.s. I lead out, hoping he would donk-raise me. He was almost robotic at it.

I like a lot..This is the kind of play that will make me slow down a bit when I'm playing very aggressive, esp from the button

I think the PF call is bad, if you think his range is wide enough to make KJ a playable hand then you should raise imo.

Like throwemaway, i like the flop play a lot.