Can he be raising me here with good but worst hand?

[Hooked]

over 80 hands 22 / 10 / 1.4 this is a tricky spot but he could be raising me here with a second best had such as AQ, any comments would be greatly appriciated.

Full Tilt Poker - No Limit Hold'em Cash Game - $0.50/$1 Blinds - 5 Players - (LegoPoker Hand History Converter)

SB: $118.50
BB: $15.40
UTG: $30.40
Hero (CO): $138.20
BTN: $99.20

Preflop: Hero is dealt K[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/spade.gif[/img] (5 Players)
UTG calls $1.00, <font color="red">Hero raises to $5.00</font>, BTN calls $5.00, 3 folds

Flop: ($12.50) 8[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/spade.gif[/img] (2 Players)
Hero checks, BTN checks

Turn: ($12.50) Q[img]/images/graemlins/diamond.gif[/img] (2 Players)
Hero checks, <font color="red">BTN bets $5.00</font>, Hero calls $5.00

River: ($22.50) A[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets $17.00</font>, <font color="red">BTN raises to $40.00</font>, [i]Hero????

[thac]

Well since you [censored] up flop and turn, I would at least call this river, if I didn't shove.

[snowbank]

bet flop homeeeeeeeeeeeeeeeeey