Hooked On Sister

About a year ago, my sister and I became sexually involved with each other.

I've always been single, jumping from one casual relationship to the next. She did get married some years ago, but when her husband and her discovered she couldn't have kids, their marriage went downhill. The divorce was rather nasty.

So I invited her over to stay at my place while it was decided what was gonna happen to her appartment. We spent a considerable amount of time together and, since I was single at the time, I started to get uneasy with her presence. She's always been very open minded about sex and her personal image, so it was very common to see her in very tiny clothing during mornings. Truth be told, even at her age (she's older than me, currently 45), she's an extremely sexy and desirable woman. Picture a tall, slender woman, with the boobs of porn actress Hitomi Tanaka on a delicious brown-skinned latina woman with long, curly hair, and you get the picture.

One night, while watching a movie, a sex scene came on. It's the thing that usually makes family members awkward while watching together, and I felt that way. She didn't: I didn't even see it coming when she leaned in, sat on me, and started french-kissing me and grinding against my crotch. I stopped her in shock, and she casually responded: "yeah, like you've never wanted to".

And she wasn't lying. I fantasized about and jerked of to her a lot when I was a teenager. She once caught me jerking of using one of her bras. I was extremely ashamed, but she just took her bra way and laughed it off. She teased me about it for years, and she started to be more carefree about what she wore around me, letting me see her in just panties and a t-shirt, for example.

So I just said fuck it, and fucked her. When we were done with the first round, I started to feel uneasy, guilty. She gently calmed me down and told me something along the lines of"sex is just sex, pleasure between two people attracted to each other, regardless of anything else. Just enjoy the moment". She kissed me deeply and got me hard again.We fucked that night until we were exhausted and my dick was sore. She's a very passionate lover, the kind of woman that just "washes over you" the moment you feel she's wet and moaning. I didn't even think to ask if she was on the pill. She didn't even ask me to wear a condom.

A year later, and we're still at it. Her bastard ex took her appartment, so she moved in with me indefinitely, which was just perfect. At first it was just sex, and we kept exploring new things together. Even if she's now on the pill, we mostly do anal to avoid any risk of pregnancy. But she loves the taboo of having her own brother fill her pussy with cum ("breed me, baby", she tells me when I'm about to cum, and that usually drives us mad and leads us to cumming together). We've even resorted to swinging and group sex, things I had never even considered before.

She was more inclined towards open relationships: her marriage was like that, both she and her husband could hook up with other people. It's been different with me: we only bring other lovers into our relationship on mutual consent, and she's not seeing anybody else. Neither am I. We're living like a married couple, even if we haven't put a tag on the kind of relationship we have. We don't have any other family left, so aside from keeping it a secret from ou friends, we're very free and fulfilled with the whole thing.