Is this play routine?

[JTG51]

.50/1 PLO. The preflop raiser starts the hand with $40, SB has $39, and I have them both easily covered.

UTG folds. UTG+1 raises to $3. MP and LP call. I call on the button with 9 [img]/images/graemlins/spade.gif[/img]8 [img]/images/graemlins/spade.gif[/img]7 [img]/images/graemlins/diamond.gif[/img]6 [img]/images/graemlins/heart.gif[/img]. SB calls and BB folds. Five to the flop.

Flop: A [img]/images/graemlins/spade.gif[/img]7 [img]/images/graemlins/spade.gif[/img]7 [img]/images/graemlins/heart.gif[/img]

It's checked to me and I bet the pot, $15.20. Only the SB calls.

Turn: [A [img]/images/graemlins/spade.gif[/img]7 [img]/images/graemlins/spade.gif[/img]7 [img]/images/graemlins/heart.gif[/img]] K [img]/images/graemlins/diamond.gif[/img]

He checks, I check.

River: [A [img]/images/graemlins/spade.gif[/img]7 [img]/images/graemlins/spade.gif[/img]7 [img]/images/graemlins/heart.gif[/img]K [img]/images/graemlins/diamond.gif[/img]] 4 [img]/images/graemlins/diamond.gif[/img]

He goes all in for $20.80 and I fold.

Is this routine? Anything I should have done differently? Any other lines of play to consider?