3 betting turn w/ one pair

[Lunar Tweak]

Live 15/30 at the Wynn. Button recently sat down and seems like a LAG, BB is a tourist who doesn't have much of a clue.

i open-raise A [img]/images/graemlins/club.gif[/img]8 [img]/images/graemlins/spade.gif[/img] from the hijack, button 3-bets, BB takes two to the face, and i call.

Flop 3 players (9.5sb)
8 [img]/images/graemlins/diamond.gif[/img]2 [img]/images/graemlins/spade.gif[/img]4 [img]/images/graemlins/spade.gif[/img]

BB checks, i bet, BU raises, BB calls, i call.

Turn 3 players (8bb)
8 [img]/images/graemlins/diamond.gif[/img]2 [img]/images/graemlins/spade.gif[/img]4 [img]/images/graemlins/spade.gif[/img][9 [img]/images/graemlins/heart.gif[/img]]

BB checks, i donk, BU insta-raises, BB feels obligated to call, i 3 bet...?

sexy or not worth it even if i'm 75% sure i'm ahead? comments on flop also appreciated.