top top vs turn donkbet

1/2/3

Vil A is a semi-competent reg. Hes pretty tight in general, haven't seen him get out of line. Iv played with him the last 2 sessions and have never seen him take a line like this. But im sure he thinks im FOS sometimes (he saw me try to bluff raise a river that ended up giving villain 2 pair a couple days ago) (~250 behind)

Vil B bought in full, but seems fairly stationy--has only been at the table like an hour. (~200 in behind)

I have both covered

folds to me in MP with and i make it 12

Vil B calls in the SB, Vil A calls from BB

Flop

Check, Check, I make it 30. Both call.

Turn

Vil B checks, Vil A makes it 75, Vil B doesnt look happy, Hero?

I mean i feel like this is pretty polarized to picked up equity or a small flush that he wants to protect. Im not sure how often its a stone bluff due to vil B still in the pot. Thats just my impression though.

I'd give up, he has KcQc/Jx sometimes but it is not at all clear what to do on river.

plus vil B probably has a J which makes it less likely A has the other one. Or B is acting which is super bad news.