Correct raise-fold donkbet on the turn?

[Clover362]

you can't fold, i probably call then call a bet on the river expecting to see a worse king but mabey two pair

[invictus33]

Call the donk bet, call the river. I can't imagine folding TPTK when HU. I'm even calling the 3-bet and a river bet here as well.

Just noticed that this was short handed as well. I'm even more inclinded to get to a showdown. Villian took a really strange line and I want to know what s/he has here, especially an unknown. A cheap showdown would be better, but I don't think a raise on the turn is that bad a play.