Calisto liking cute things was
mentioned at the end of Renny's sidequest (she REALLY like kitties), and a few times in omakes as well.
I figured that Renny getting training from Catherine would allow me to get the same training accomplished without stepping on your toes regarding your girl. And I think AB had that in mind as well by revealing that Catherine was a boxer. The cutest agent thing was not something I talked with AB about at all. I had no idea that Renny would get such attention from Catherine, Pamilla or anyone else. But having her train Renny seemed like a good idea, so I suggested that after so Chizuru would be free to attend to Pierce's training. (AB seems to think it'll also be funnier)
You already got "groupies" of your own in a way. Or rather, more likely, you're getting sleeping partners like Shizuka, Jeanette, Irene and Chizuru in relatively short order.
I'd wouldn't predict Renny getting any sort of action like that for quite a while.