"I wouldn't consider yourself a step mother at least until you're married."
At least until you are married.....but preferably.....what? Married forty years?
We are not married, but we've been together seven years, lived together three (in a house we bought jointly, I didn't move into his home). We have no plans to marry, don't see why we should. You don't have to be married to be a mother so why do you have to be married to be a step mother?
I don't care if anyone here thinks I am a step mother or not - but dss lives with us 90% of the time. I work at home, or have breaks and don't work, so I do a lot of the household stuff. dss bought me a mothers day card this year.
Course, his 'd'm doesn't think he should call me step mother either. Not that I have ever asked to be called it.
Mind you, I'm not that interested in what she thinks, especially since the dp she lived with (for a shorter time than we have been together) was referred to as stepdad and despite still living with him she has a new bf who she has now told dss to refer to as his step dad and his son as his new 'brother'.
All just smacks of bitterness to me.
Anyway OP - I've always thought the best approach is to act like a big sister or trusted aunt. Not too soft, not too harsh, something in between who they can turn to, feel secure with but don't feel overwhelmed by or feel is in conflict with their mother.