Nl600 i'm weak with KK

[mak15]

villain is zero2lose. he's 21/17/4 over a lot of hands. i think my read of him is a pretty standard unremarkable multi tabler. my image should be sLAG, he know's me well enough to probably think i can do some weird stuff, including 3betting wide, but i havn't done anything weird during this session. i always bet the river here but didn't this time. i'll explain my logic after i get a few responses. i was talking poker with another 2+2er during the hand so i thought about it more than normal, and maybe overthought myself. also, if i bet the river, 300 fold to a raise?

Party Poker No-Limit Hold'em, $ BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero ($1023.17)
Button ($214.75)
SB ($1796.11)
BB ($235)
UTG ($1249.60)
MP ($143.65)

Preflop: Hero is CO with K[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/diamond.gif[/img]. SB posts a blind of $3.
<font color="#CC3333">UTG raises to $21</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $70</font>, <font color="#666666">2 folds</font>, BB calls $64, UTG calls $49.

Flop: ($213) 7[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="#CC3333">UTG bets $130</font>, Hero calls $130, BB folds.

Turn: ($473) 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, Hero checks.

River: ($473) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, Hero checks.