Andrew Carr a Terran with (unknown-to-him) psi powers has found his way to Darkover and has a unique connection to a kidnapped Keeper (Callista, whose twin sister Ellemir has called on their kinsman Damon for help while their father Esteban is out on a mission).
This 1974 is perhaps the least sexist novel yet in the series, but...
I am sorry to have unwittingly aroused a desire I cannot satisfy.
says astral projection Callista to hard bodied Andrew through their psexy psychic connection. When you read MZB thinking about the incest claim made against her by her daughter, you notice a lot of excused trespasses.