She came out
About a month ago, after concluding her 3rd divorce, my older sister (she's 47, i'm 45) came out and told me true the reason she's never been able to fulfill a successful marriage: she's been in love with me since we were both in highschool, and said she didn't want to spend the rest of her life trying to be with the wrong people. she wanted to start a relationship with me.
at first i was shocked. but i have always loved her, at least in the sibling kind of way, and being honest with myself, she's always was one of the kindest, more caring people i've ever known, and truth be told she's deliciously beautiful (she never had kids from any of her marriages, and is as hot as a 19 year old girl. trust me)
after her confession i put a little distance between us for like a week... and after giving it some thought, i invited her over to my place for dinner. we talked about it... and ended up making love... and then fucking like perverts. i don't know if it's the taboo thing, but i have never had better sex in my life. and holy fuck, she's a delicious whore. a woman that really knows her body, enjoys it, and let's her partner enjoy her.
next morning i broke up with my then-girlfriend. my sister and i have been lovers since. i don't know if it can last, but if you've ever been on the fence about committing incest, but have a viable chance of getting away with it, i highly recommend it.
Sounds like you two have found something special. Good on you!