Questionable river payoff

[thesharpie]

Crypto £1/2, villain is 36/0/2 over 44 hands. Wouldn't he bet a flush draw on the turn, and wouldn't he just call with a better 10? I felt he was either doing some weird slowplay or was FOS. What about the river value bet?

Preflop: Hero is BB with T[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/heart.gif[/img].
UTG calls, <font color="#666666">2 folds</font>, SB calls, Hero checks.

Flop: (3.00 SB) 3[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, Hero checks, UTG checks.

Turn: (1.50 BB) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, Hero checks, UTG checks.

River: (1.50 BB) T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">UTG raises</font>, SB folds, Hero calls.

Final Pot: 5.50 BB.

Edit: Both these cats had high wtsd%, which swayed me to not bluffing before I hit, and also to value betting the river.