Like 10th hand into the match, no reads, except this is his 3rd 3bet since we sat down.

What's the best line here?

Full Tilt No-Limit Hold'em, $0.25 BB (2 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

BB ($24.50)
Hero (SB) ($25.43)

Preflop: Hero is SB with J, A
Hero bets $0.75, BB raises to $2, Hero calls $1.25

Flop: ($4) K, 5, 6 (2 players)
BB bets $4.25

Total pot: $4