Been with partner a year, now living together. Me and stepson have swapped phone numbers - he is 15 (quite young and shy for his age) we have sent a few text about DPs birthday, silly memes, photos of dogs etc. My friends think it is odd. I think its nice that we are friendly. I'd never text him in school hours etc. I think its nice and I feel more like a big sister to him and don't want a mum role as he can look after himself. I've said i'm happy for my DP or stepsons mum to read the messages. I'm not doing it to be a parent and organise childcare etc as that is between DP and his ex. Any advice welcome.