2/4 - tptk facing river c/r

Villain is a 6max tag regular, maybe a little looser pre than most. We've never played hu before and are only playing now because the table broke down and there's a fish sitting out we're hoping will sit back in. We've played maybe 6 hands hu so far, nothing interesting yet. Recent history... a few minutes ago when the table was 6-handed he opened utg, I called otb with AKo and he 3 barreled a K97 rainbow 3 turn 9 river with 65s and I called down for ~75bb.

Full Tilt No-Limit Hold'em, $4.00 BB (2 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

SB ($479.00)
Hero (Button) ($652.10)

Preflop: Hero is Button with A

K

Hero raises to $12.00, SB calls $8.00

Flop: ($24.00) 4

Q

2

(2 players)
SB checks, Hero bets $20.00, SB calls $20.00

Turn: ($64.00) A

(2 players)
SB checks, Hero bets $50.00, SB calls $50.00

River: ($164.00) 5

(2 players)
SB checks, Hero bets $120.00, SB raises to $397.00 (All-In), Hero...