What is my medium over-pair beating here?
 

Villian is 20%/3% after 130 hands. Seems pretty week. His over-bet on the flop looked like TP or an over-pair. However, when he led out on the turn after calling my raise I wasn't sure what he had. Maybe a set, 4 5, an over-pair. Either way I struggled to think of what I was beating with this action. Suggestions on all streets are welcome.

Party Poker No-Limit Hold'em, $.50 BB (9 handed) FTR converter on zerodivide.cx

Villian ($59.40)
Hero ($56.03)

Preflop: Hero is UTG+1 with 9[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/heart.gif[/img]. SB posts a blind of $0.25.
<font color="#666666">1 fold</font>, Hero calls $0.50, <font color="#666666">3 folds</font>, CO calls $0.50, <font color="#666666">1 fold</font>, SB (poster) completes, BB Villian checks.

Flop: ($2) 2[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">Villian bets $3</font>, <font color="#CC3333">Hero raises to $7</font>, CO folds, SB folds, Villian calls $4.

Turn: ($16) 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Villian bets $14</font>, Hero?