NL200: A strange turn bet

[Buconero]

Full Tilt Poker - No Limit Hold'em Cash Game - $1/$2 Blinds - 8 Players

SB: $196.05
BB: $108.60
UTG: $432.75
UTG+1: $186.20
MP1: $212.70
<font color="black">Hero (MP2): $207.40</font>
CO: $58.70
BTN: $198.25

<font color="black">Preflop:</font> Hero is dealt 9[img]/images/graemlins/diamond.gif[/img] T[img]/images/graemlins/diamond.gif[/img] (8 Players)
UTG folds, UTG+1 calls $2, MP1 folds, Hero calls $2, 2 folds, SB calls $1, BB checks

<font color="black">Flop:</font> ($8) 6[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/club.gif[/img] T[img]/images/graemlins/heart.gif[/img] (4 Players)
<font color="red">SB bets $3</font>, BB folds, UTG+1 calls $3, <font color="red">Hero raises to $14</font>, SB folds, UTG+1 calls $11

<font color="black">Turn:</font> ($39) 4[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">UTG+1 bets $20</font>, Hero ???

No read on vilain as its the first circuit since I joined the table. Is this a donk bet or has he hit his straight and wants to be sure he gets paid off?