Bellagio 2/5 Hand

Playing 2/5 at the Bellagio

Effective stacks of $700. Game is capped at $500 but V & H have been playing for a bit at this table

I consider V to be a generally OK player. Bellagio regular with lots of hours of play in the room and at these stakes.

H generally has a tight profile - I don't play a lot of hands.

PF
V is UTG and opens for $15
Folds to H in CO with QsTs, calls $15
Remaining fold

F - $37
KJ8 rainbow
V checks
H bets $15
V insta-calls

T - $67
KJ8A rainbow
V checks
H bets $50
V insta-calls

R - $167
KJ8AA
V checks

What are you doing here?

I know there might be problems with other parts of the hand, but I'm most concerned about my river play. My main thought was that V opened UTG PF, OK player, so I know he's not just goofing around.

What are you doing after a V check?