NLCASH Flopped two pair gets raised on river.

[NatalieBella87]

Cobia (Heads Up) 0.25/0.50, hand converted by the iPoker Converter at Talking-Poker

Button ($133.70)
BB Hero ($50)

Preflop: Hero is in the BB with T 3
Button calls 0.25, Hero checks.

Flop (1.00) T 3 6
Hero bets 0.75, Button calls 0.75.

Turn (2.50) 8
Hero bets 2, Button calls 2.

River (6.50) 2
Hero bets 5, Button raises to 20, Hero?

This is my 2nd game of HU cash, but evan I can tell villian is a total fish. They have been calling any two cards preflop, and calling down with any whiff of the flop. They have made a couple of moves, but not that many. I think I was titling by this point, the barstard kept hitting with his rags. Am I ever ahead on the river?