Bet the river?

[Lethe]

MP is a megalag. Plays 95% of his hands, and raises 50% or more. BB is tight, and while certainly not passive, isn't overly aggro. My image is pretty rocky at this point as I've raised PF and folded to 1 bet on the flop twice, and b/f the flop a few times after raising preflop. I've also been fairly card dead.

The game is playing 6 handed as a few people are off on dinner markers.

Folded to MP who open limps, I raise 98s in the CO, folded to BB who 3bets, we call.

Flop: K 8 5 (2 diamonds and I don't have one)
BB Checks, MP checks, I bet, BB calls, MP folds.

Turn: 7
BB checks, I bet, BB calls.

River: J
BB checks, hero ??

Easy b/f?