I’ve always fancied my girlfriend’s sister, Lucy. We’ve always flirted with each other and whenever we go out together we always do some sexy dancing, even if my girlfriend is there, and I know she’s been able to feel my hard cock against her firm arse. I’ve also seen her naked a couple of times by accident. Over the summer we all spent a long weekend down at their family home. The weather happened to be good and Lucy spent a lot of time wandering around in her bikini and I got to ogle her sexy body and big tits. Her family has some holiday flats on their property and the Monday was a changeover day and Lucy’s step-mum asked me, my girlfriend and Lucy if we would mind cleaning the flats. We set to it and as it was hot the girls were wearing nothing but mini skirts and bikini tops. It was great watching her gorgeous tits bouncing around while she scrubbed. While she was dusting a low table she accidentally flashed me a good shot of her hot-pink thong which was very sexy. I made a cheeky comment about her flashing me, but all she did was smile and go back to dusting without changing the view. Ten minutes later my girlfriend, who had been cleaning the bedroom, came into the living room saying she had to go to the supermarket to get some more cleaning stuff and would be back in an hour. At this point Lucy went into the other room and came back in 2 minutes later. I assumed she’d just been to the loo. She got back to cleaning, but when I turned round again she was giving me the same shot as before up her miniskirt, but with one major difference. She had removed her thong! Her pussy was shaved and I could see that she was wet, pink and swollen and obviously turned on. I wasn’t going to pass this opportunity up, so I walked over to her. She could hear me walking towards her, but didn’t move from her position. ‘You’re doing a great job there’ I said as I slid my hand up her leg and started to rub her wet pussy. She sighed and said ‘So are you’. She stood up, turned round and kissed me hard pushing her tongue into my mouth. My hand moved from her pussy and onto her big, firm tits. Her nipples were rock hard and as I pinched them she let out a low moan. We both quickly stripped off and she was soon down on her knees sucking my cock. Her technique was better than her sister’s, and she was also deep throating my cock which her sister can’t do. I got her to spin round and plant that hot pussy on my face. I started to suck her clit whilst flick it hard with my tongue which drove her wild. Suddenly she said ‘I need your cock up me.’ She span round and slowly sank onto my cock, moaning as it slid in. She started to ride my cock and I was calling her a cock-loving slut and a whore and made her fuck me. I was also focusing on her big, hard nipples which I was sucking on hard making her moan even more. She then got off, bent over the sofa and told me to fuck her from behind. I slammed my cock into her and proceeded to pull it almost all the way out and then slamming it back in, making her grunt each time. She was begging me to fuck her harder; she was like a bitch on heat. I then started to rub her juices in to her tight little arsehole, guessing correctly that she liked arse play (after all, her sister does!). I soon had two fingers buried up to the knuckle and was finger fucking her arse hard. She was loving that so I decided to replace my fingers with my cock. I pulled out and pressed me helmet against her sphincter and she just moaned ‘Yeeeeeesssss’ and spread her arse cheeks with her hands stretching her hole that little bit wider. My cock started to slide up her arse and she let out a loud groan as my cock entered her tight arse. Soon I was all the way in and I started to fuck her harder. Lucy was completely out of it know. As I fucked her arse and rubbed her clit she was moaning all sorts of expletives. I could feel my balls start to tighten and I said ‘I’m going to cum!’. I pulled out of her arse and proceeded to unleash my load all over her face as she had her third orgasm. That was the first time we fucked, but since then we’ve shagged at every possible opportunity, including in her living room while my girlfriend and her boyfriend were asleep in the next room. If you like this story I’ll try and find time to post that story.