With a scary board, I kinda just like to get it over with. Now the thing about his play-back is this: it took several seconds for him to decide to do that. I couldn't think of any explanation for that if was already made, so I put him on a single high club.

Maybe he was worried I had hit the ace-high?

Table is awfully weak; hence the modest PF raise (3BB)

PokerStars No-Limit Hold'em, $0.25 BB (9 handed)

UTG ($24.25)
UTG+1 ($15.50)
MP1 ($14)
MP2 ($10.80)
MP3 ($3.70)
CO ($19.80)
Button ($29.75)
SB ($28.20)
Hero ($31.30)

Preflop: Hero is BB with A, A.
UTG folds, UTG+1 folds, MP1 calls $0.25, MP2 folds, MP3 folds, CO calls $0.25, Button folds, SB folds, Hero raises to $1, MP1 calls $0.75, CO calls $0.75.

Flop: ($3.10) 8, T, 3 (3 players)
Hero bets $4.75, MP1 folds, CO raises to $18.8, Hero calls $14.05.

Turn: ($40.70) 4 (2 players)

River: ($40.70) 2 (2 players)

Final Pot: $40.70

Results in white below:
Hero has Ad As (one pair, aces).
CO has Qc 9c (flush, queen high).
Outcome: CO wins $40.70.