Since the wedding, Lyn and I had become even closer than we had been, if that were possible. From Sunday night until Friday evening we would concentrate on our studies, but at the weekend, we would forget about college and school, and spend as much of the weekend together, sleeping together if we thought we would not get caught.

 

My parents told us they were going to see old friends in Aberdeen for the weekend, as it was their 20th wedding anniversaries, a few days apart, and that they would be leaving the two of us in the house. They warned us not to have a party, and that Paul and Morag would be checking in on us. We told them we would be good, and waved them off about 5 on the Friday evening, they told us they would phone us or Paul when they arrived.

 

We had just gone back into the house, fully intending to straight up to my room to have a weekend in bed. As I got to the kitchen, there was a knock on the back door, it was Paul, asking if we wanted to go over to join them for a few hours, saying he did not want us to feel too lonely. (Lonely !! we could have kept each other happy for hours), and before we could make an excuse, he told us he would not take No for an answer. He also told us to take over swimwear, so we could try ouy his new Hot Tub. (I had seen him working on something on the patio for a few weeks, but had not had the chance to speak to him about what it was).

 

Lyn and I went up and changed, she was wearing a fairly short white pleated skirt, and white shirt, I could see her dark blue bra under it, she also flashed her dark blue panties. I was wearing a dark blue polo shirt and shorts. We locked the house and went over to theirs. When we arrived, Morag offered us a drink, saying she had made some punch if we wanted some. We both said we would try it and we all went to their lounge. Paul told us he was heating the water a bit and it would be ready for us in about 30 mins. The punch was strong, but tasted great, and by the time the hot tub was ready for us we were onto our 3rd glass.

 

Paul then told Lyn she could change into her costume in the dining room, then I could change there after her. The 2 of them went up to their room to change, and by the time I was changed the 3 of them were in the tub. I joined them, and Morag gave me a glass of Champagne. I took it although it was not my favourite drink. After a few glasses, Morag said she had to pee, and stood up in the water. Her body was incredible, her boobs looked a lot bigger, and she seemed a little fatter. I could not take my eyes off her as she got out of the water and made her way to the toilet. Lyn said she needed to pee too, and when she stood up I noticed she had grown too.

 

As we sat there waiting for them to return, Paul slid over and sat next to me, and asked what I thought of Morag's body, and as he asked, I felt his hand touch my now fairly hard cock. I turned to tell him she looked great, and he took my hand and put it onto his fully hard cock. We hed been wanking each other when he moved back to where he had been sitting, he had seen the girls coming back. I just hoped that they would not be able to see my hard cock under the water.

 

When they were both back in the water, Morag told us she was pregnant, and that was why she looked a little bigger. Paul turned to Lyn and asked her what her excuse was ?? Lyn was a little offended by the comment and said to Morag, do you think I am getting fat. Morag said she looked a little heavier. Morag asked her to stand, which she did. It was obvious to even me, that she was putting on weight in the same area's as Morag. (Could my sister be pregnant too ??).

 

Paul then suggested that they both take off their swimming costumes, which Morag was happy to do, Lyn was a little more reluctant, but soon the 2 of them were standing in front of us totally naked. Although there were almost 12 years between them, they both looked very similar, Morags boobs were bigger, but it was obvious they both had a bump in the same place. Morag asked if there was any chance that Lyn might be pregnant, but she said she had only had unprotected sex a couple of times, and looked in my direction. Morag said she had a spere test, and they went off to try it.

 

When they came back, Morag told us that Lyn was pregnant too, and that she would be back in a minute. I told them I would go to make sure she was ok, and when I got up, both Paul and Morag could see my huge hard cock. I went to find Lyn, she was in the bathroom, crying, and as I walked in, she told me she was sorry, I told her it was my fault as I had been too keen to fuck her on a couple of occassions. When she had calmed down, we went back and joined Paul and Morag in the pool. When we got there, Paul was now naked, and Morag was wanking him. As we got into the water, I took off my trunks, revealling my hard cock too.

 

When we sat down, Morag left Pauls cock alone. She turned to Lyn and asked if she knew who the father was. Lyn started to cry again, and Paul said, is it not obvious !! Morag looked at him, then Lyn, and she saw Lyn was looking at me. She then seemed to realise what had happened, and moved over to sit between Lyn and me. She put her arms round us, Lyn then started to cry again, and leaned on Morags boobs. I did not know what to do at this point, I just wanted to comfort Lyn, but Morag was in the way, and as I tried to reach over to Lyn, I felt my hand brush against Morag's hard nipple. I was fully hard in seconds, the top 3" of my cock now visible above the water.

 

Paul saw my reaction and started to wank his hard cock, this made me even harder, and it was at this point Lyn saw my cock. I felt a hand touch it, and satrt to wank me, it felt good, my sister and our pregnant neighbour sitting naked next to me, and watching my friend Paul wanking. Morag started to moan, it was then I realised that my sister was feeling her up, Iknew I was about to cum, when Paul moved towards me, and stood up, wanking his cock. and as he was about to cum, both Morag and I opened our mouths, Lyn saw what was happening and just stared in amazement as Paul let his cum fly, over both our faces, most of it going into Morags mouth. I then stood up to find it was Morag who had been wanking me, and as I started to cum, both Morag and Lyn opened their mouths to receive it.

 

All in all it had been an interesting evening, finding out, and seeing Morag pregnant, getting wanked by Morag, watching Paul cum, and me letting Lyn see me drink it, and finding out I had impregnated my own sister !!!