What if there was some kind of Theater Location?
If you send a girl there and watch her work, you would see this over the shoulder view of Eros and several patrons watching a live recording of the girl taking on several guys at once.
You could have the option to send multiple girls to work at once. Either in an orgy, or just the two of them as lesbians. (That would make more sense if the girls had some story together like Hana and Kaisa)
Then there could be a final option if you send all the girls to work there at once. Either you could watch the girls all have a lesbian orgy, or Eros could choose to join in.