Mum had told us that if we did well in our end of year exams, she would take us away on holiday for 2 weeks, anywhere in Europe. I knew that I would do ok, but was not to sure how my sisters would do. My social life became restricted to a Friday and Saturday. Linda had a part time job in the pub, that we'd had sex in, and could only study 2 nights a week. Alice was living in a flat with her mates, and seemed to be partying all the time.

It had been a few months since David's party, and we had not seen much of him or Maureen since then. We kept in touch by phone, and David and I had many "phone wanks". I had spoken to him a few weeks before, when he called to say Maureen had gone into labor. I told him I would meet him at the hospital if he wanted me to. Linda took me in to it, (she had recently passed her test). Maureen was huge, and screaming like a banshee. She welcomed us into the room and asked us to stay when the baby was born, I was a little uncomfortable but agreed.

To try to distract her, Linda asked if she had enjoyed the party at Christmas, she said she had wished we could have met up again. Soon she started to have her baby, it was a girl, then the midwife said she was having another baby, it was a girl too. David looked shocked but happy. I was feeling less happy as her "bump" reduced in size, but her boobs were Huge.

Linda and I were still sleeping together every night, EMMA had not been around for a while. I wore her underwear when we fucked, but had not been fully dressed for a while. She then asked if I was getting bored with her, I told her I would never be bored with her. She asked if I would like her friend to join us, but I would have to be EMMA, I said if it is what you want.

A couple of week later, Linda said her friend was coming for a sleep-over on Saturday night. It was only 2 weeks till my exams, so I studied as much as I could before it.

We were due to meet Linda's friend at 20.00 on the Saturday night, in a local pub. I started to get dressed at about 18.00, Lida started to get ready at 19.00. We left to meet Joanne(Jo), and when we arrived at the pub she was waiting for us. As we moved through the crowd, we both got some indecent propasals, if only they knew. Jo kissed me on the cheek, and Linda on the mouth. We sat and had a few drinks, Jo told me how pretty I was, but seemed more interested in Linda. I soon had to go for a pee, but which toilets to use !!. Linda went with me and we used the Ladies. We went back to our table and joined Jo. By now she had taken off her shirt and was just wearing a vest top, her boobs were a lot bigger than Linda's. I saw her reach under the table for her "bag", then Linda looked at me, Jo was stroking her pussy. I started to get hard. Linda told Jo, she could do that later. Jo asked me if I was going back with them, I told her I could if she wanted me to. We had a few more drinks then decided to leave.

We got a taxi when we left, Jo asked if I was sure I wanted to go, I told her I was, as Linda and I had been together a few times. When we got back to the house, Linda grabbed a bottle and we went to "our" room. We went up and put on some music. Jo said she was to warm and took off her top, Linda did the same. Seeing 4 lovely boobs in bras was too much for me. I started to get hard, and Linda saw this. She turned to Jo and said I have something to tell you. She asked me to stand up. Jo asked what it was she had to say, she undid my skirt, and as it fell to the floor, exposing my huge hard-on,  she said, EMMA is my brother