I don't really worry about linking my original erotica to my fanfic for a couple reasons:
1) The kinks I write in my original fiction are similar to the kinks I write in my fanfic, and I feel like there's a decent amount of audience overlap.
2) I already know several people in my fandoms who either write both fanfic and original erotica or who participate in fandom under their non-fanfic writing pseudonym.
Also, I keep both my erotica and fanfic-writing names separated from my real identity as much as possible, so I don't mind linking them so much.