I mean depending how things go, I kinda don't see Rachel hitting it off with anyone but Ashe, UNLESS one purposefully goes that route. I think the thing with Rachel is that something is off with her and Bella and I am just theorizing that it stems to Ashe. I think that Bella at some time had a thing for Ashe, but given Ashe's complex, she was oblivious to it, hence current state Bella being the bitch she currently is. And I think that Rachel might have known about Bella's crush on Ashe, but kept quiet about it, probably because she may have discovered some feelings of sort for Ashe after their wonderous night of hay hay, and is still in denial about things and such.
So if there was possible sharing involved,I think the semi logical reasoning would be for someone both Rachel and Ashe have some common ground with and not some rando. Fiona would be a maybe, maybe a possible one off.
Here is the thing with Vanessa. I don't really see her as the type to share, kinda akin of sorts to Bella from SG who I definately pick up on the vibe and similarities with. Although, maybe depending on how things shake up and what not, I kinda see her being the one to be a cuckqueen and maybe try to make it up to Ashe by more or less 'Pimping' Ashe out with some girl(s) to make things right, as I really don't see her as the type to give herself up for sex per se. But maybe thats just my own personal view/feeling I'm getting from Vanessa. -Shrugs-