Fish donks 2x pot into combo draw

[cassette]

BB is running 50/17/2.3 over 170 hands.
SB is loose, short and bad.
I'm playing about 22/17 and have taken down a few recent pots uncontested.

I could see BB donking like this with KQ or 77. No real idea what the best line is.

No Limit Holdem Ring game
Blinds: $2/$4
6 players
Converter

Stack sizes:
UTG: $1188.25
UTG+1: $374.10
Hero: $409.50
Button: $484
SB: $120
BB: $459.65

Pre-flop: (6 players) Hero is CO with 9[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/heart.gif[/img]
2 folds, <font color="#cc0000">Hero raises to $16</font>, Button folds, SB calls, BB calls.

Flop: 7[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/heart.gif[/img] T[img]/images/graemlins/heart.gif[/img] ($48, 3 players)
SB checks, <font color="#cc0000">BB bets $104</font>, Hero folds, SB folds.
Uncalled bets: $104 returned to BB.

Results:
Final pot: $48