I am assuming your mother is a single mother or now widowed. If she is still married to your father, then it is not right to carry on such a relationship, like a couples relationship, while he is still married to her. If this is the case, it depends on whether she wants to fix the marrieage or get a divorce before she is clear to date or commit to someone.
My second husband is much into fantasizing about me being his mom sometimes in sex. You know how everyone usually have some situation which they like to think on during sex. However you are talking about more than a sexual thing, at least f rom what I can tell. YOu said relationship. If you are not yet of the age of consent, even if you are not sexual, the chance it could be so, gets people riled up if they see you both act anything other than mother and son.
What you propose to do here, even if Mom is legally single now, is going to be hard to hide. As long as you live in the same neighborhood and can be seen by neighbors, school, work collegues and other family and friends, you won't be able to hide it well. It make take relocating to somewhere people don't know you and keep yourselfs very private. Then you might be able to carry it off as a female who's a cougar and the young man who is into her. Just know that if it gets too much attention you may be in a same boat as those harrassed by racists and the LGBTQ community by the fearful and uneducated. [ Dragonflymagic's advice column | Ask Dragonflymagic A Question ]
Attention: NOTHING on this site may be reproduced in any fashion whatsoever without explicit consent (in writing) of the owner of said material, unless otherwise stated on the page where the content originated. Search engines are free to index and cache our content. Users who post their account names or personal information in their questions have no expectation of privacy beyond that point for anything they disclose. Questions are otherwise considered anonymous to the general public.