KK Turn Decision

[Shooternewt]

3/6 Full Table Eurobet. Sorry for the manual input, I am at work, but this hand has not gotten out of my head all day. No great read on MP1 (if I had a read, this wouldn't be an issue), typical Pokerroom drone.

Hero has red KK in the CO

Preflop

3 folds, MP1 calls, MP2 calls, 1 fold, Hero raises, one fold, SB calls, BB calls.

Flop (10 SB) 8d 6d 5h

<font color="red">MP1 bets </font>, MP2 folds, Hero raises, SB calls, BB calls, MP1 calls

Turn (9BB) As

<font color="red">MP1 bets </font>, Hero??

Very drawy board, large pot, what does this donk bet typically mean? Two pair? Continued draw? Lower PP? Thoughts?