$1000 eff. My image young TAG grinder. V young guy... newish to the table, has played no hands in last 15-20 mins. No other reads.

I open AcKs to $50 in UTG. V 3bs to $150 in UTG+2, I flat. HU flop.

Flop: Kd9h9d Pot ~ $320 Check around.
Turn: 3c Pot ~ $320 I bet $170, he calls.
River: 9c Pot ~ $660

You and why? Feedback on all streets much appreciated.