NL25SH JTo TP linecheck vs donkbet + coldcall

[stever1k]

PokerStars No-Limit Hold'em, $0.25 BB (6 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

MP ($39.25)
Hero ($24.15)
Button ($28.35)
SB ($25)
BB ($9.45)
UTG ($12.15)

Preflop: Hero is CO with T[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/heart.gif[/img].
UTG calls $0.25, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $1</font>, <font color="#666666">1 fold</font>, SB calls $0.90, <font color="#666666">1 fold</font>, UTG calls $0.75.

Flop: ($3.25) 3[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">UTG bets $1</font>, <font color="#CC3333">Hero raises to $3.5</font>, SB calls $3.50, UTG folds.

Turn: ($11.25) A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, Hero checks.

River: ($11.25) T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $2</font>, Hero ...

How to play the turn? SB is pretty unknown :-(

Is checkbehind turn okay here? Do I have to raise this tiny riverbet? But: which hands that I beat would call a reraise? If villain hits his set (33,66), he beats me and would reraise, a busted hand would never call a big reraise.