As grace came running into our room I was just coming out of the bathroom but could clearly see several globules of semen over her face in her hair and one dripped off her chin right down the top of her bikini between her tits. She wanted to get to the bathroom but I stopped her and with my finger wiped the globules off her face into her mouth she tried to resist but was soon sucking my finger. I opened her bikini top and rubbed the sperm into her nipples that were soon rock hard. I grabbed her hand and pulled her over my knee and puller her thong bikini bottoms right into her bum and started a long and hard spanking till she was screaming for me to stop. I eventually let her stand but pulled her thong off and bent her over the back of one of the chairs before ramming my solid prick right into her and gave her a really good fucking and she was soon gripping my prick with her vaginal muscles and we both orgasmed together. She then asked me why Sean's spunk tasted sweeter than mine and I said he eats more fruits like Pineapple than I do. I asked how Abi and Sean were and she said laughing that she hoped that Sean was at least feeling fulfilled as had wanked him off. Then said that she hadn't massaged the gel into Abi so she put her bikini back on and we both went next door and as soon as we got inside Sean was so apologetic to us both till I told him that it couldn't be helped and that Grace should have known better. Grace asked Abi if she need the gel massaging in she just nodded as I said that I was going for a shower as I was leaving I smiled at Sean and just said " I hope all three of you enjoy yourselves" with a cheeky grin on my face . Grace looked at me and I just smiled and said " Do as you are told." and left the room Grace takes up the story again I walked over to the bed were Abi was as they had separated the beds into two singles and pulled the cotton sheet back to see that Abi was holding a rabbit vibrator in her hand and was blushing she put it to one side Sean then went and sat on the balcony and I started to massage the gel into her skin and was soon massaging her tits much bigger than mine and her nipples were soon very large and solid . I then worked my way down her tummy and onto her legs as I did so she opened her legs and her lips were really red and swollen and again she blushed but I just ignored it and was massaging the top of her thighs and just the inner thighs as well as I moved my hands to the lower part of her stomach my hand were very close to her clitoris and accidently my left hand slipped over it but I quickly moved it away and she started to moan my hand slipped between he legs and the moaning got louder and her hand came and rested on top of mine and pushed my hand between her lips and my middle finger soon found its way into her soaking wet cunt all I could hear was her moaning for more and before I realised it I had three fingers inside her and was finger fucking her while the palm of my hand was grinding into her clit. Without realising it my breathing was getting stronger and I realised that my other hand was rubbing my clitoris And I had moved so that I was kneeling between her legs as he was having a massive orgasm I then realised that My bikini top was being undone and turned to see that Sean was stood behind me and as I tried to object he just mention remember what Greg said and relaxed as he was soon massaging my rock hard nipples I realised that I was really thrusting my fingers in and out of Abi and she started to squirt all over the bed as I sudden felt Sean trying to get his massive dick inside me and shouted " no you are too big" then a massive stinging pain and he was thrusting his massive cock that I could not get my hand around earlier . I felt it deeper than anything before and realised that Abi was sucking and biting my nipples and realised that his hot spunk was filling me up. he stood up and went to the toilet as Abi said to me how did you enjoy having sex with your young sister in law and her boyfriend . I rolled over and was shocked as he stood up an sat on my face and without thinking I was soon sucking and licking out her cunt.. I eventually stood up and ran into the bathroom to see 3 large love bites around my nipples and my cunt was wide open after receiving a good fucking by Sean's massive prick. Abi came into the bathroom to find me sat on the toilet crying but told me to just enjoy my first spit roasting and no to worry. I said " How can you say that I have just had sex with my 19 year old sister in law and 30 year old boyfriend while my dearest faithful husband is quietly resting next door" " Grace you really are as innocent as Greg says you are aren't you Greg has not been faithful the week before we came he slept with a woman in ,Manchester and it was his wish that we had this session together." I ran out to our room as I knocked I ran inside when Greg opened the door . I see that you have had a good time then I said as Grace rushed in with the bites on her tits and her cunt lips swollen and gaping wide open and spunk still dripping out. I pulled her to me and she just kept thumping my chest while crying her eyes out and we just there for about 30 mins before she said that she was so upset that she had been coerced into what had just happened even though she had allowed it and had mainly enjoyed it. We talked for over two hours and by the end we finished up in bed and although she wanted me to fuck her she was still stretched wide and my little dick could not satisfy her. the rest of the holiday went well and the incident was not mentioned again . We went to Emma's 16th birthday party and I spoke to Emma and she apologised for making too much noise the other night and asked me to tell grace they had both taken her advice.. grace told me alter that she ha advised them both to go and get the morning after pill and she was pleased that they both had. But added that she did not realise that Rose had also lost her virginity the same night without protection. The end of the holiday arrived too soon and our sex life was back to what it had been at the start of the holiday and Abi told me that she had actually thanked her for bringing sexual enjoyment to her life. O n the following Monday morning we both got up and as Grace had a shower and came down I was shocked to see that she was not wearing stocking or tights as she had an excellent tan. she was wearing a skirt that was quite short for her and a blouse with a white bra underneath but could be seen through her blouse. When she got home she told me that for the first time she had gone out for lunch with all the other younger girls in the offices and had a glass of wine. this became a regular lunch time for her. it was after four weeks that she came home and said that she had been invite to a girls night out in town that Friday . So I agreed and told her I would drop her off and pick her up but was told that it could be a late night and they would all be getting taxis home. Friday arrived and she was dressed to thrill in a black PVC waspie and short red PVC skirt and red satin thong. The uplifting cups of the waspie made her 32c tits appear a lot bigger with quite a bit of cleavage showing. I dropped her off and she said that she would be ok getting a taxi home as two of the others lived not far away. it was about 3.00am that I heard a car pull up and heard two women shout goodnight before Grace replied and came in as quiet as she could . I got out of bed and went downstairs to see her in the kitchen taking her pill before turning to me as I said " do you need that then? " " No but I hope I do shortly and she grabbed hold of my bulge as it started to grow " We didn't wait to go upstairs as I bent her over the kitchen table dropped my PJ'S and moved her soaking wet thong to one side and was soon as deep as I could get and she was so wet that I asked if she had already been fucked but she said not but had been finger fucked twice. that made me even randier and I soon emptied a full sack of spunk deep inside her. we went to bed and she was so randy that we had sex at least twice more that night It was in the October that She told me that she would be late home on the Thursday as Rob one of the blokes in the office was coming in to work after his wife had given birth to their first child on Sunday and his in laws were arriving on Wednesday from their home in Costa del sol so he would have a free evening. I had to go into work early so As grace was getting her shower I told her to enjoy herself and to ring if she needed picking up but she said that she would be ok and would get a taxi. I got home after collecting a Chinese on the way as I didn't know what time to expect Grace. I watching the Europa league game on tv about 9.15 pm had just gone upstairs to get my I pad which had been on charge when I saw a car pull up outside and saw Grace in the front passenger seat and a bloke leaned over and in the street lamp opposite could clearly see his hand up her skirt as they kissed . she got out and I turned away and went to the toilet. and flushed the toilet as she came in and made my way downstairs and seemed shocked o see her although not really. She seemed rather flustered and her neck was all red and flushed I gave her a quick kiss and was shocked to see that she was wearing hold ups with a short skirt which would mean that depending how she was sat her stocking tops would be visible she was also wearing one of her holiday black lace bras and white lace tops .as he went to pas me to go into the kitchen I grabbed her and my hand shot up to find her thong was soaking wet and she pushed my hand away . I smelt my hand to find the unmistakeable smell of spunk. I challenged her and she admitted that she had had sex with Rob and over the next few hours admitted to it being the third time they had had sex in the back of his car and that she had in fact had sex with a man when she went on the girls night out. I then had to admit that since our holiday I had been having an affair with Emma my mate's daughter we met in Ibiza . Grace finally admitted that she can't get enough sex. I then told her that Abi held regular sex parties at her and Sean's house and if she wanted we could go a Fortnight on Saturday but we would have to get the all clear from a sex clinic first as condoms were not used and if you didn't have a text from a GUM clinic stating you were clear you could not go. Needless to say I mad us both an appointment on the following Day after being told they held a walk in clinic on Friday evenings at our local hospital. What happened at the party to follow shortly