Set text correctly for links to incest scenes where exactly one daughter or sister is available
Fixes unresolved "_daughter2" or "_sister2" appearing in Slave Interact links when exactly one daughter or sister is available (i.e. you are not in the "one of her sisters/daughters" case).
It's better this way than actually resolving them as pronouns because it will yield the actual relationship (so you might now see "Fuck her with her twin sister" or similar). Could even stick the name there if we wanted, too, like we do with fucking friends, but that didn't seem necessary.
