When he flats both flop and turn I think he normally doesn't have any 8x fh in his range. I also think him having 7x is very unlikely, and I think he still calls with overpairs
PokerStars - $0.05 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4
BTN: $12.41 (VPIP: 17.36, PFR: 15.28, 3Bet Preflop: 10.00, Hands: 148)
SB: $5.22 (VPIP: 18.97, PFR: 12.93, 3Bet Preflop: 3.92, Hands: 121)
Hero (BB): $5.45
UTG: $7.07 (VPIP: 18.60, PFR: 6.98, 3Bet Preflop: 0.00, Hands: 44)
MP: $3.64 (VPIP: 50.00, PFR: 50.00, 3Bet Preflop: -, Hands: 2)
CO: $6.75 (VPIP: 25.00, PFR: 19.12, 3Bet Preflop: 11.67, Hands: 139)
SB posts SB $0.02, Hero posts BB $0.05
Pre Flop: (pot: $0.07) Hero has A♥ A♦
UTG raises to $0.10, fold, fold, fold, SB calls $0.08, Hero raises to $0.46, UTG calls $0.36, fold
Flop: ($1.02, 2 players) 8♥ 9♦ 6♦
Hero bets $0.60, UTG calls $0.60
Turn: ($2.22, 2 players) 8♣
Hero bets $1.30, UTG calls $1.30
River: ($4.82, 2 players) 5♣
Hero bets $3.09 and is all-in, UTG calls $3.09
Spoiler
Hero shows A♥ A♦ (Two Pair, Aces and Eights) (Pre 88%, Flop 91%, Turn 2%)
UTG shows A♠ 8♠ (Three of a Kind, Eights) (Pre 12%, Flop 9%, Turn 98%)
UTG wins $10.54