3 people in love hotels?

Hi I am new to this, I'll be going to tokyo soon with my girlfriend and we are staying at a love hotel for a few days. So she has a cuckquean fetish and would like to watch me do it with another girl. But as far as im aware, love hotels do not allow 3 people right? What if the DH girl is just visiting for an hour? would that be ok? Or do you guys recommend us something else that my girlfriemd can watch me do it? Thank you for your replies!