This guy was 38/9.
Should i cbet this or how should i play this?

Party Poker No-Limit Hold'em, $ BB (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP1 ($111.85)
Hero ($114.15)
MP3 ($151.85)
CO ($141.75)
Button ($100.30)
SB ($99)
BB ($62.02)
UTG ($43.75)
UTG+1 ($117.77)
UTG+2 ($34.18)

Preflop: Hero is MP2 with K, K. SB posts a blind of $0.50.
4 folds, Hero raises to $4, MP3 calls $4, 4 folds.

Flop: ($9.50) A, J, A (2 players)
Hero checks, MP3 bets $5

Final Pot: $14.50