My family decided

I'm a bit of a black sheep and I work for the family business; I 31 was promoted and needed to travel as part of my job. My family knew I required a PA and to make sure I didn't get any girl who worked with me pregnant, gave my younger sister Eva 28 as my PA. Eva is the straight lace type a no-nonsense type of woman. Doesn't date at all, doesn't dress to impress either, also having the same surname suggests without saying we're married. Name tags show the same surname and people assume. Another fact we share the same room when away, my family thought it would keep my mind on the work not women. It worked for a while, then I saw Eva in her bra and panties, just quick glimpse but it got my hormones stirring who could say. I was now sexually attracted to my sister, an almost impossible task you might think. Eva the non-dater and her brother the womanizer, both have strong wills. I decided to fuck my sister at least once, one rule was to be followed, no assistant by alcohol or any other drug used to seduce her. I'd to seduce without any help whatsoever. Turns out Eva was shy of men not opposed to men as my family thought. She was comfortable around me because we were raised together. It just needed the right setting and right timing. It came seven months after I'd decided to try and seduce Eva. A rainy day no meetings and boredom in a hotel room together on the balcony sitting looking at the rain. She complained of a cramp in her leg, at first, I just gave a rub down. But as I did it, I realized it might be my first real chance of seduction. So, I suggested we go to her bed, and I give her a full massage. She agreed and she was in shorts and a top, not wanting to frighten her. I didn't ask her to remove any clothing; I started at her neck worked my way right down to her toes and she was enjoying the massage. The more I massaged the more relaxed she became, I final said you'll need to remove your shorts and maybe your top. Just testing how willing she was, she removed both no resistant at all. Fondling her ass no reaction, moving my hand around her front and fondling her breasts still no reaction. Now feeling really bold I put my hands inside her panties, no response at all. Fingering her no response except for soft moaning, rolled her on to her back and continued fingering her. Removed her panties and bra no reaction, finally without asking I mounted her and fucked her, pulling out and Cumming on her belly. That night we slept together and have slept together ever since, only our mother has seen how really close we've become. But she doesn't think we're having sex, just thinks it more brotherly sisterly type closeness. If only she knew, but one thing has really changed, I'm not chasing women anymore as I've the perfect one in my bed every night and I'm keeping it in the family you can say.