NL25 - A7s TP and FD facing donk

[Superman26gt]

I have a TAG image, villain knows this and is 35/1.8/.92 over 52 hands.

Ultimate Bet No-Limit Hold'em, $.25 BB (5 handed) Hand History converter (http://www.learnhowtoplaypokerfree.com/convert/convert.cgi) Courtesy of PokerZion.com (http://PokerZion.com)

saw flop|<font color="#C00000">saw showdown</font>

Button ($19.75)
<font color="#C00000">SB ($24.25)</font>
BB ($27.86)
UTG ($28.06)
<font color="#C00000">Hero ($42.43)</font>

Preflop: Hero is MP with 7/images/graemlins/spade.gif, A/images/graemlins/spade.gif.
UTG calls $0.25, Hero calls $0.25, <font color="#666666">1 fold</font>, SB completes, BB checks.

Flop: ($1) 9/images/graemlins/spade.gif, 3/images/graemlins/spade.gif, A/images/graemlins/diamond.gif <font color="#0000FF">(4 players)</font>
<font color="#CC3333">SB bets $1</font>, BB folds, UTG folds, <font color="#CC3333">Hero..</font>

How much here?

edit: not a donk, my mistake..I'm not used to playing unraised pots.

[Nick C]

A standard raise seems reasonable -- mainly just to disguise your draw (I mean, the seemingly passive SB did bet into three players on an ace-high flop, and there's a good chance you don't currently have the best hand).