[5NL] KQs in BB...Got the 2nd nuts

[Cobra_1878]

Villain was 26/17/5 through 762 hands. 57% cbet on flop & 57% cbet on turn.

Had a few notes on villain. He didn't get out of line a lot but was capable of spewy moments. I had seen him stack off with TPGK before. Had also seen him stack off with a GSSD & FD on flop. Which obviously tells you he likes to play his draws aggressively.

PokerStars - $0.05 NL (6 max) - Holdem - 5 players
Hand converted by PokerTracker 4

UTG: $5.00
CO: $6.56
BTN: $8.31
SB: $19.96
Hero (BB): $6.31

SB posts SB $0.02, Hero posts BB $0.05

Pre Flop: (pot: $0.07) Hero has Q K

UTG raises to $0.20, fold, BTN calls $0.20, fold, Hero calls $0.15

Flop: ($0.62, 3 players) 8 7 T
Hero checks, UTG bets $0.60, fold, Hero calls $0.60

Turn: ($1.82, 2 players) 6
Hero checks, UTG checks

River: ($1.82, 2 players) 2
Hero bets $1.50, UTG raises to $4.20 and is all-in, Hero ???

Interested to see what people would put villain on?

Obviously I have the 2nd nuts but what else can we put villain on other than A high flush?

We know he plays his draws aggressively, which would explain the PSB on flop. Can we put villain on 2P/set and slows down because of the straight that could be out there on the turn? If that was the case though, he wouldn't suddenly wake up on the river and shove would he?

Can anybody put villain on anything other than the nut flush?