Fucking one's mum is only second to fucking one's preteen daughter.
Congratulations.This should have appeared under the MY Family tag.
7 Years is quite a commitment.Respect her and don't dump her in her old age,if this story is real.She is not a sex toy.And don't talk to even your future wife about this.Keep both relationships and respect distinct.
I am not condoning Incest but once in it respect and love for your lover is paramount.Understand her need when she seduced you instead of judging her .It's unfortunate that she had to turn to somebody else for legitimate satisfaction,emotional or physical.At least she didn't turn towards somebody outside and trusted you.So don't betray her ever.
I am in a similar situation.In my case ,I was 19 years old and she was into alcoholism after her divorce.My father never returned to even look at me.She is now fully cured of alcoholism,thanks to sex with me.we don't think at all about this being sinful.I am grateful to her for satisfaction of my instincts,the trust she reposed in me and the training.She is grateful to me for weaning her away from alcoholism and loneliness.No one knows about our behind the door relationship and no one will.We truly respect and love each other.To hell with societal mores and religious stipulations.As long as no one is hurt and no children result,why should anyone bother?I wish I could communicate with you with email.Sadly,we are never invisible on the web.