I have a bad case of one-itis which is why I am slowly succumbing to pressure from my girlfriend to move in with her and her 3 teenage daughters. I have not bonded with her daughters and have been told 'you can't tell me what to do you're not my real dad'. The real dad is very much in the picture which I find uncomfortable.

I own a flat in the city where I work and if I move in with her I'll have to commute 2 hours a day. I feel I'm making all the sacrifices here. I'm also cautious about being one man in a house full of women; I asked for a friend's advice on this and his opinion was 'you may as well put your balls in a box'. I feel like after 2 years of good times I am now being called upon to step up and do my duty. Is there any way this can turn out well?