Opp just c/r'd A high board

[fees]

Guy is 18/14, rdog on stars if anyone knows him. seems like a nit, and I dont know much else. He 3b my utg open once OTB I folded. No history, im playing laggy and running the table over for the most part. aside from sets I dont see wtf he could really have here so.. easy 3b bluff?

Poker Stars, $1/$2 NL Hold'em Cash Game, 6 Players
LeggoPoker.com - Hand History Converter

MP: $68
fees (CO): $347.60
BTN: $224.10
SB: $289.50
BB: $116.75
UTG: $105

Pre-Flop: 6 6 dealt to fees (CO)
UTG folds, MP calls $2, <font color="red">fees raises to $10</font>, BTN folds, SB calls $9, 2 folds

Flop: ($24) 8 2 A (2 Players)
SB checks, <font color="red">fees bets $16</font>, <font color="red">SB raises to $48</font>, <font color="red">fees raises to $115</font>