77 SB defense - I struggle with this situation

[Isura]

No reads. FWIW, I find when the button opens and then caps HU, it doesn't necessarily mean a strong hand. Hence, my guess was that villian was on something like 55+, AT+,KQ+, T+ suited brodway. I have no idea how to proceed from the flop. I guess I should c/r the flop? What do we do when 3-bet. Completely lost on this hand. I didn't want to check/call or fold the river, so I bet..

Party Poker 1/2 Hold'em (6 max, 6 handed) converter

Preflop: Hero is SB with 7[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Button raises</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Button caps</font>, Hero calls.

Flop: (9 SB) Q[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets</font>, Hero calls.

Turn: (5.50 BB) 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets</font>, Hero calls.

River: (7.50 BB) 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>