A sadistic Princess should have a sadistic knight.

"Kagura, I did not raise you to be stubborn," King Gintoki spoke, his voice stern.
"Yes, Gin-chan, you didn't. But, alas if you had set me up with a Prince, I would be even more uncooperative than now. But, you did raise me to meet people halfway if one can not satisfy them fully. So I will accept a valiant knight by my side. Only one."