No Limit Holdem Ring game
Blinds: $0.50/$1
9 players

Stack sizes:
Hero: $115.85
UTG+1: $57.60
MP1: $144.70
MP2: $96.50
MP3: $101.75
CO: $104
Button: $24
SB: $102.40
BB: $116

Pre-flop: (9 players) Hero is UTG with K K
Hero raises to $4, 2 folds, MP2 raises to $13.5, 5 folds, Hero calls.

Flop: J 5 Q ($28.5, 2 players)
Hero checks, MP2 bets $19, Hero

I really suspect AA here for a tight player, (I only had 50 hands on him with stats 12/3.5 in PT), but if so, a big raise or push from me must be very scary for the oponent on this flop right? Calling seems wrong, but I could reason that I now am behind AA, QQ and JJ and then fold?
Thoughts?