Heads up hand during live home game this weekend. I have about 65% - 35% chip lead.
I'm on the button and the big blind (strange home rules).
Blinds: 50 / 100


Hole cards: Q 5

PF: Opponent raises to 300, I call (600 pot)


Flop: J 3 6


Opponent: ALL IN

My read:
Opponent (who, IMO, is a tight-ish but aggressive player) has a pair of jacks with possibly an outside chance for higher flush draw (worst case). Losing would place my opponent in a commanding chip lead.
If my read is correct, I have 12 outs or worst case: none.


What would you do? Call or fold?