Hand against Surfbullet

[Kyle]

10/20 4 handed.

I havent played a lot of pots against surf so my read on him isnt good. I do know that he likes to play middle pairs passively OOP in blind steal situations. However he knows I am a 2+2er but I have no clue what my image to him is. Perhaps a little laggy cause I tend to carry that around with me. Anyways....

I open on button with QJs. Foled to surf who calls in the BB.

Flop comes 4 J 7 two spades. I have no spades.

I bet and he calls

Turn comes 2 spades. I bet he calls.

River comes offsuit 7 and he leads. My line?