continuation-bluffing a flop donkbet 3-way

[Sir Winalot]

PokerStars No-Limit Hold'em, $0.25 BB (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

UTG ($15.30)
MP ($29.95)
Hero ($23.10)
SB ($39.85)
BB ($21.05)

Preflop: Hero is Button with A[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $1</font>, SB calls $0.90, BB calls $0.75.

Flop: ($3) 2[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">BB bets $0.75</font>, <font color="#CC3333">Hero raises to $4.25</font>

No reads. Fwiw, this isn't a standard play for me in a 3-way pot. What do you think?