100NL Turned two pair faces heat from unknown

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.50/$1
8 players
Converter

Stack sizes:
UTG: $181.50
UTG+1: $53.90
MP1: $122.25
MP2: $93.50
CO: $160.10
Button: $96.50
SB: $99
Hero: $103.50

Pre-flop: (8 players) Hero is BB with K:spade: 8:diamond:
2 folds, MP1 calls, MP2 calls, 3 folds, 3 folds, Hero checks.

Flop: K:club: 2:heart: J:spade: ($3.5, 3 players)
Hero bets $3, MP1 folds, MP2 calls.

Turn: 8:spade: ($9.5, 2 players)
Hero bets $7, MP2 raises to $18, Hero ???

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Villian here is a complete unknown, this is one of my first hands at the table.

What's your move here to the raise?

I feel like the only hand your beating here is a draw (plausable) but this looks a lot like KJ or 22, I don't mind laying it down here.

I think you're facing an overzealous AK.

"Hesitantly" call the turn, since if you raise, villian might, just might, be smart enough to lay down.

Then, try to check-raise the river to get most of your chips in.