Because it's the men's side, and she's a respectable lady.… why couldn’t the nurse lady be the one who joined him in the hot springs!?!
And with the way she's acting, she kind of deserves being forgotten.To be brutally honest, I've already forgotten about this princess.
IIRC One of Tahara's settings is he being a siscon.So the guy was actually a siscon or turned that way after the hardships he experience in the old world.