Fold my boat on two pair board?

[ChexWithRaisins]

Playing 6-handed 0.5/1.0 NL. Villain is 27/12 with AF of 1.

PokerStars No-Limit Hold'em, $1.00 BB (5 handed) Hand History converter Courtesy of PokerZion.com

Button ($260.80)
SB <font color="#A500AF">(Villain)</font> ($99)
Hero ($100)
UTG ($141.95)
MP ($90.15)

Preflop: Hero is BB with 7[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, MP calls $1, <font color="#666666">1 fold</font>, SB <font color="#A500AF">(Villain)</font> completes, Hero checks.

Flop: ($3) 7[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Villain bets $2</font>, Hero calls $2, MP folds.

Turn: ($7) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Villain checks, <font color="#CC3333">Hero bets $3</font>, Villain calls $3.

River: ($13) 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Villain bets $93 (All-In)</font>, Hero folds.

Final Pot: $106

I don't see him making this bet with just a 7. Even if he does, I'm not giving up too much considering we'd be maxing the rake just to split a $12 pot. It does not make sense for an outright bluff. I think I just have to put him on 76 here and fold, right?