There would be 2 more partners you can easily get 0<0
Rinny (Succubus?) - assuming you found the key to the locked gate in the abandoned town from the warehouse that the catgirl (Cassie) is staying at, explore the entirety of the park where you came upon a succubus currently being harrased by fairies
Fawn (Deer) - Fawn usually appears for the first time after you buy your room in the New Ark City's hotel. "^^