J9s CO on KJJr: J9s vs BU 1.5x

Hero
J♥9♥
Position
CO vs SB
Pot
Limp-Raise Pot
Flop
K♦ J♠ J♣

J9s is a standard open from CO; once BU 1.5x opens and SB folds, flatting is fine but 3-betting is preferred to isolate and leverage position.