Sister at 42, divorced moved in with me

My sister has always been a hottie. As a girl, as a teen, and as a 20 year old married mother. She is now 42, grown kid, divorced and alone. She is still amazing to look at. Mid height for a woman, great body, firm and toned, brown hair on milky white skin. She needed some help financially, I did what I could to help her. She finally sold her house asking if she could stay with me for a few weeks till she found something. It was fine with me. My kids also grown and my wife passed away I was alone in a really big house. So Sis moved in and things were to take a turn I never expected.

Don't get me wrong. I actually would spy on her and my mom (I'm one year younger than sis) to see them naked any chance I got. She was and is HOT. My mom had D cup tits, sis had C's that were so nice on her body size. We shared cooking duties, but she did all the cleaning and laundry firing my maid. Without even thinking about it 3 months had gone by. Sitting with a glass of wine in the evening we were talking. She asked why I had no one over for the night sometimes. I was unsure, and she said "you're wife has been gone for 2 years now and I haven't see you getting laid here even one time". I told her I hadn't. She responded that she hadn't been laid in 15 months since her husband moved out and she was hating every minute of it. I thought she meant having her husband but no she meant not having sex. I told her I really didn't want to "date" someone again it was all BS anyway, and I didn't want that, nor want some relationship needy woman hanging on. On the second bottle, she stood up and said. "OK, then that's it, we've had a relationship since you were born, we love each other a lot, will do anything for each other and we're both horny as fuck". I responded OK, but what was she saying. With that she just said it. "I need to get some sex, you need sex, we live together already so why not?" "Why not what?" I asked. "Why not have sex with each other, who gives a shit about that incest bullshit, you need to fuck someone and I need to get fucked, so why not? Look I do oral, anal, vaginal, you can cum on my pussy, in my pussy, on or in my ass, on my tits, my face I do it all. You're hot, I'm in good shape too" and she wanted to keep going. Instead I stood up put my finger to her mouth and took her to the bedroom.

My sister and I fucked three times. Hard in her mouth, she was great, I couldn't wait to get to blow in her mouth, but wanted to fuck that time. Then we fucked twice in her pussy and once in her ass. Hell I hadn't done more than once in a session in 5 years, then it was only twice. She is great looking, but when she naked, even her face is more beautiful. So now, she lives here, isn't moving out, we worked out all our relationship BS when we were kids. We've grown to know each other sexually now and we fit like a glove. At first she'd move her stuff into a spare room when relatives or our kids come by, now we don't even do that. We are brother and sister, we live together, we have sex together, and sometimes with a third joining. We love it.