Bike 40 - Two Pair

I open KTs in the CO and both blinds call. Main villain is an older middle aged Asian guy in the SB who gives recreational player vibes.

Flop QT9tt, I have a BDFD. They check, I bet, only SB calls.

Turn Ar. SB donks, I call.

River Kr. SB checks. I tank and then check it back.