(FR) AKo - flush draw in 3bet pot and a monotone board

$0.10 NL - Holdem - 9 players

Hero (BB): 118 BB
UTG: 44.1 BB (VPIP: 40.00, PFR: 30.00, 3Bet Preflop: 0.00, Hands: 10)
UTG+1: 87.9 BB (VPIP: 11.76, PFR: 5.88, 3Bet Preflop: 0.00, Hands: 17)
MP: 63.2 BB (VPIP: 5.88, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 17)
MP+1: 99.5 BB (VPIP: 7.69, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 13)
MP+2: 0 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 4)
CO: 100 BB (VPIP: 66.67, PFR: 33.33, 3Bet Preflop: 0.00, Hands: 3)
BTN: 66.3 BB (VPIP: 71.43, PFR: 14.29, 3Bet Preflop: 0.00, Hands: 7)
SB: 97.3 BB (VPIP: 21.43, PFR: 14.29, 3Bet Preflop: 0.00, Hands: 14)

SB posts SB 0.5 BB, Hero posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has A♣ K♥

UTG calls 1 BB, fold, fold, fold, fold, CO raises to 5 BB, BTN calls 5 BB, fold, Hero raises to 21 BB, fold, fold, BTN calls 16 BB

Flop: (48.5 BB, 2 players) 7♥ 3♥ 9♥
Thoughts and questions:

Hero bets 23.1 BB, BTN raises to 45.3 BB and is all-in, Hero calls 22.2 BB

Turn: (139.1 BB, 2 players) 6♦

River: (139.1 BB, 2 players) 7♠