The tourney is the 888 superstack in sheffield. Even though the tables are 9 handed, we are playing with 5 dead stacks/sitouts.
In this hand I am on the button, the blinds are sat out and villain is sat next to me on my right. We have played a few hands together already and he has pretty much owned me so far, despite me having position on him.
Blinds are 50/100. My stack is 18K (from 20K start) and villain has about 25K (he has been mopping up all the dead chips despite my best efforts)
Pre flop action goes fold, fold, villain makes it 275. I look down at A3o and make it 675. Villain calls. Flop comes 369 (2 hearts - I have no h) (pot 1500)
flop action: check, I bet 800, villain cr to 2100, I 3bet to 4K, called. turn is As giving me 2 pair (pot 9500) reason for 3 bet was because villain had already cr a lot of flops. once vs me in similar positions and a couple of other times v another guy.
turn action: villain donks 6500, me

You can comment on pre and flop action if you want, but please be kind, I have never played 4 handed this deep before
What do you do ott, why and plans for later action if applicable?
Thanks in advance