what hands do you bet this turn with?

I b/f QQ-TT (and would probably b/f river again against one player and check back against 2). I'd probably check back 99 and would play poker on the river (raising 6x, calling most rivers for one bet, and value betting some river cards if it's checked to me again).

I think I raise 99's and TT's on the flop and just call QQ's and maybe JJ's. The 99's and TT's need the protection.

As played, I'd bet all hands on the turn.

If somehow I am here on the turn I think I bet any pair

I'd b/f all these hands on the turn, and then check back some rivers and b/f others. Also def checking back any river if both villains call turn.

you'd b/f 99? that cant be correct

Bet 99
Check tt-jj
Bet QQ

I think there are merits to playing this whole range the same. They're close enough in equity that slicing it up adds unnecessary complexity to the decision tree.