I'd say my T didn't do anything in particular besides being herself. Any woman about 8-15 years older than me who is consistently kind to me and listens to me used to spark my transference intensely. Less so now because I am working that need out with my T. So basically she just did her job-- listened and was non judgmental. It doesn't take much.

Eta : for ME it doesn't take much to spark my need foraternal love is what I mean by "it doesn't take much"