My older Sister

I'm Kevin 23 work in a factory and single, I live with sister Heather 34 lawyer single. My mother died several years after my birth and my father died when I was 14 in a work accident. I was raised by my aunt Rhonda my late father sister, Rhonda looked after me till I left school, I've never been a great student and got a job at a factory. Rhonda moved a year later to be closer to her son Robert and I lived alone in a 1-bed apartment for a couple of years. Heather had finished her university law courses and got a job with a large law firm. She also got a 2-bed apartment and it was closer to work and she is my only relative left in the city, I moved in with her. I've not been very successful with women and likewise Heather has been good with finding men. We're average in looks and build and don't stand out in a crowd, Heather would rather read a book then go dating anyway. I go to a bar for a couple of drinks, then come home and watch TV. Our other sibling Ross is in the navy and posted overseas. We're a boring pair at the best of times and sometimes go out together for a meal and or a movie. Last July we traveled to visit Rhonda and to attend Robert's wedding, while there we stayed together in the same motel room. After the wedding reception, we return to the motel and I had another drink and then needed to go to the toilet. It wasn't the drink but something I had eaten at the reception wanted to come back up. I entered the bathroom and let it out in the toilet, Heather was in the shower at the time and wasn't happy I just entered. But seeing me being sick, she stopped telling me to get out and tried to help. It wasn't anything serious, just something that didn't sit well inside me. After I had got it out no more problem, Heather went back into the shower and I on my way out asked if she wanted me to wash her back. Being cheeky as ever, she replied okay and I'll wash yours. I was sure she was trying to get me to back down and so I accepted and turned towards her and started to undress. She didn't back down and we washed each other's back, then late while our beds I asked her if would like a back rub. She agreed and so I started to rub her back and I enjoyed feeling her body so much I got a hard-on. Shortly after she turned over and saw it. With a sly smile on her face, she asked why I had a hard-on. I replied it has a mind of its own and has taken a fancy to you suppose. She replied it has good taste and wanted to see it out of my shorts. So I got it out and she looked it over and then touched it and shortly after started to stroke. I could see she like it and so I asked her if I could see her topless and she removed her top. I started to stroke her tits and she played with my cock, I moved closer to her and put one hand between her legs to feel her pussy between her legs. At first, she resisted a little but then spread her legs apart to give full access. I put my hand inside her panties and started to finger her, then looking at her and I started to ask her about letting me fuck her. Before I finished my request, she nodded at me and we had sex for the first time. Waking up beside her in the morning and her still asleep I just sat looking at her till she opened her eyes and smiled at me. So taking it as a green light I started to feel her up and we had sex again. Since then we have slept together ever since.