If Erin doesn't want Jacqui to stop, Dani's occupied at the moment. I'm thinking the strap-on is either for Caitlyn (she's the one who left to get it) or Mallory. Have we seen Erin and Mallory together before? This is a "La Ronde" situation again, but even then, I don't think that particular pairing happened. And perhaps I should have typed "temporarily."
While sharing orgasms would be awesome for sex, having it long-term would be a hassle - think about it happening while sleeping, or driving (though at least I assume it's a dry orgasm in Adrian's case, otherwise it'd be awkward as hell, heh). I wonder about this in the context of the 'future' guest pages we've seen - was that going on then?
But for real Erin using the strap-on on Mallory seems like it'd be a no-brainer - I'm sure that would feel *amazing* given the current context.