seems pretty standard to me but i think i need reassuring of this in case i'm missing something and being exploited through aggression by nits . villain is 11/8 over 500+ sample. cbets flops 66%, turn aggression frequency is only 14%. i cant see him going to two streets with AJ here or turning KK into a bluff. standard fold?

Absolute/UB Cereus No-Limit Hold'em, $0.50 BB (8 handed) - Absolute/UB Cereus Converter Tool from FlopTurnRiver.com
Button ($52.32)
SB ($48.78)
BB ($13.25)
UTG ($58.45)
UTG+1 ($50)
MP1 ($54.55)
Hero (MP2) ($58.68)
CO ($141.33)
Preflop: Hero is MP2 with A, K
1 fold, UTG+1 bets $1.75, MP1 calls $1.75, Hero calls $1.75, 3 folds, BB calls $1.25
Flop: ($7.25) 6, A, Q (4 players)
BB checks, UTG+1 bets $4.50, 1 fold, Hero calls $4.50, 1 fold
Turn: ($16.25) 9 (2 players)
UTG+1 bets $9, Hero ?
Total pot: $16.25 | Rake: $1.30