Need advice

I am a father of two (4 y/o and 3 y/o boys) and I recently moved in with my girlfriend who has no kids. I'm wondering what should be expected of her.To start, I don't have them full time, just most weekends. In my mind, her moving in with me comes with the occasional babysitting and general care of them. She does a great job with them and they love her. But she also says she is not my babysitter. She has watched them for short periods of time, like while I go for a coffee run or to pick up take out. But that's the extent of her watching them on her own. I know she isn't their parent, and I'm not asking her to be. But would there be some inherent expectations for her entering into my family? Not sure if I'm asking this correctly. Could someone give me some advice? via /r/Parenting http://ift.tt/2alIGVf