Super wierd line, anyone calling the river?

Villain is 20/12 over 110 hands.

First off, yeah, the 3bet pre is not good.

As played though, I know we're getting excellent odds and all, but does anyone feel like the river is ever a bluff? Only a bare ace or maybe a very oddly played QQ make sense as a bluff, wheras he can have a lot of slowplayed 2pr or a set.

River is probably too small also, but I felt he could have quite a lot of worse pair + draw that he could fold to a bigger bet.

Poker Stars, $0.10/$0.25 No Limit Hold'em Cash, 6 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite.

BTN: $12.50 (50 bb)
Hero (SB): $95.83 (383.3 bb)
BB: $32.52 (130.1 bb)
UTG: $100.52 (402.1 bb)
MP: $25 (100 bb)
CO: $46.03 (184.1 bb)

Preflop: Hero is SB with Q K
2 folds, CO raises to $0.75, BTN folds, Hero raises to $2.50, BB folds, CO calls $1.75

Flop: ($5.25) K T J (2 players)
Hero bets $3.75, CO calls $3.75

Turn: ($12.75) 7 (2 players)
Hero checks, CO checks

River: ($12.75) 7 (2 players)
Hero bets $6, CO raises to $12