Straight on river facing pot bet

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Poker Stars - No Limit Hold'em Cash Game - $0.25/$0.50 Blinds - 4 Players - (LegoPoker HH Converter)

SB: $99.65
hero (BB): $56.45
UTG: $30.00
BTN: $21.65

Reads: <font color="blue">Villain is 86/6/0.75 over just the 15 hands
He had previously called a continuation bet by me with q high, no pair no draw and checked it down...</font>

Preflop: hero is dealt 4 4[img]/images/graemlins/spade.gif[/img] (4 Players)
UTG checks, BTN folds, SB calls $0.25, <font color="red">hero raises to $3.00</font>, UTG folds, SB calls $2.50

Flop: ($6.50) 7 6[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/spade.gif[/img] (2 Players)
SB checks, <font color="red">hero bets $5.30</font>, SB calls $5.30

Turn: ($17.10) 7 6[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/heart.gif[/img] (2 Players)
SB checks, hero checks

River: ($17.10) 7 6[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/heart.gif[/img] 3 (2 Players)
<font color="red">SB bets $15.00</font>

Pot Size: $32.10

If he makes a smaller bet I call but I really didn't like the fact he near potted it, call or fold?