Donkbet by a pro

[MaxPower]

The BB is a very good professional player (and 2+2er). I don't know whether he knows my Eurobet name. I told him one time, but I'm not sure if he remembers it.

9 - handed 20/40 game on Party. Three folds and I raise with K [img]/images/graemlins/heart.gif[/img]Q [img]/images/graemlins/club.gif[/img], a decent player cold-calls, and an unknown player cold-calls on the button, the sb folds and the BB calls.

Flop: 9 [img]/images/graemlins/spade.gif[/img]8 [img]/images/graemlins/heart.gif[/img]Q [img]/images/graemlins/spade.gif[/img]

BB checks, I bet, all three opponents call.

Turn: 6 [img]/images/graemlins/club.gif[/img]

BB Donkbets (but he is not a donk) and I have 2 opponents to act behind me. What is my play?