tptk raised by lag on dry turn

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

CO: 100.6 BB (VPIP: 22.95, PFR: 16.39, 3Bet Preflop: 0.00, Hands: 64)
BTN: 41.6 BB (VPIP: 15.79, PFR: 15.79, 3Bet Preflop: 0.00, Hands: 21)
SB: 171.2 BB (VPIP: 13.33, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 17)
BB: 100 BB (VPIP: 16.67, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 6)
Hero (UTG): 101.4 BB
MP: 98.8 BB (VPIP: 16.92, PFR: 7.96, 3Bet Preflop: 1.16, Hands: 204)

SB posts SB 0.4 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.4 BB) Hero has A♥ Q♦

Hero raises to 3 BB, fold, CO calls 3 BB, fold, SB calls 2.6 BB, fold

Flop: (10 BB, 3 players) 2♦ Q♣ 4♥
SB checks, Hero bets 7.2 BB, CO calls 7.2 BB, SB calls 7.2 BB

Turn: (31.6 BB, 3 players) 9♠
SB checks, Hero bets 15 BB, CO raises to 32 BB, fold, fold

villain is a lag other player fit or fold
I was 23/23 although normally 19/16
pre standard open
flop I hit tptk but am sandwiched when sb checks I bet out
turn 9 spades appears safe so I bet again and am raised by CO
I have no idea what he is doing and fold

so its villains play I am atempting to analyse
if he hit set on flop, turn changes nothing and he gives away hand strength
it would be an outrageous bluff with lower pairs or overcard and 2 players in hand
or my guess is he hit top pair good/top kicker and bluffed me off my hand
your thoughts