For the few months after my encounter with my sister, Lyn, things had been really busy at college, which meant I did not really have time to try to meet anyone, but I was happy, as Lyn Never said No, and was always happy to join he in my bed, at weekends when my parents got up to their own thing, leaving the 2 of us in the house, usually alone.

 

Lyn was insatiable, and was always wanting to try something new, she had persuaded me to buy some sex toys, and had started to insert a vibrator into my ass as she sucked me off. I had not been too sure to begin with, but soon grew to really enjoy the throbbing sensation. She had also persuaded me to buy her a strap on, so she could fuck me up the ass. I had been fucking her in the ass for a while and she really enjoyed it.

 

I had been worried about getting her pregnant, when we first started having our fun together, but she told me that her periods were irregular, and it was very unlikely she would get pregnant. However by just before Christmas, she told me that they were coming every 28 days now, and that I could only fuck her pussy at certain times of the month, unless I used a condom. After hearing this we tended to just have anal and oral sex.

 

I was worried that Lyn was missing out on her teenage years, and suggested that she should go out with her friends more often. She reluctantly agreed, but told me she would not have sex with any other boys, if I promised not to have sex with any other girls, I agreed.

 

About a week before our college was due to close for the Christmas holidays, it was the college night out/ disco. I decided to go, and called Dave to see if he was going, but he said he would be away, but he would see me during the holidays. So it looked as if I would just be going with my classmates, none of who I really knew outside of college, but I supposed it would give me the chance to get to know them better.

 

A couple of nights before the disco, Dave called me and asked if I would do him a favour, I told him I would depending on what it was. He asked if I would mind taking his cousin, Davina, to the disco, he said her date had pulled out, and she did not want to go to her own college disco on her own. I asked what she was like, he told me she was a little older than him, about 5'8", reasonably slim, and not too bad looking. I told him I would take her, but it was going to cost him a few blow jobs. I knew he would agree to this, as he loved to suck cock, and not only mine.

 

The night of my disco, was also the night Lyn was going to hers. I asked if she was going with a boy, she said she was going with a group of her school girl friends. She asked if I was going alone, I told her about taking Davina as a favour to Dave. She said, "Remember our deal", I told her I would not have sex with any girls, but she said, I want to make sure you dont. She went into the shower, and said she had something for me when she got out.

 

I went to my room, I knew I had to get ready to go out, so I hoped she would not be too long. 5 minutes later, she came into my room, wearing her towel. She dropped the towel, pushed me onto the bed before sitting on my cock, she told me she wanted to make sure my balls were empty before I went out, so I would not be tempted. I told her that she did not have to, but I was loving the feel of my cock deep inside her, and the faster she bounced on my cock, the more I wanted to spend the night with her instead of going out. I lasted about 4 minutes, before I filled her pussy with my cum, as I started to pump my cum into her she too came.

 

Lyn sat on my cock until it went soft, she told me she was not going to wear any panties when she went out, so she could feel my sperm running down her legs, then she went to her room, telling me to be a good boy, and I would get the same every night until Christmas. I promised her I would.

 

After Lyn had left the room, I got dressed, and left the house to go and meet Davina. We had arranged to meet at the station bar next to the college, and when I got there she had not arrived, so went in and ordered myself a drink. I had only had a few sips, when she arrived.

 

The station bar was quite dark, and my initial reaction was that Dave had slightly exagerated her looks, but I was doing him a favour, and I might never have to see her again. I ordered her a drink and we went and sat next to the window, so I could see when the rest of my classmates arrived.

 

I offerred to take her coat for her, and when she took it off, I realised that she had a much better body than Dave had told me. She was wearing a tight black knee length velvet dress, which clung to every contour of her body, well every contour that I could see in the dim lighting. We were onto about our 3rd drink, by the time the rest of my class arrived, so they joined us, and we had another couple before we left to walk the short distance to the college. By now we were all a little Tipsy, we probably should not have been drinking doubles before we got to the disco.

 

I knew what I had told Lyn, but I was really begining to fance Davina, I now know that it was the booze distorting my vision, but while we had been dancing, she had let me run my hands over most of her body, and we had spent a lot of time kissing each other. When we had started dancing, I could feel my cock reacting every time I touched her body, but by now the booze was begining to take effect, and I knew if I drank much more I would not be able to perform later, so decided to start drinking coke.

 

We decided to sit down few a bit and went back to the table where we had all been sitting. It was almost 11.00pm by now, I realised that we would have to leave in the next 45 mins or so if we wanted to get the last train home, otherwise it would have been a good 10 mile walk home. We both had another drink, before we left and made our way back to the station, where we had another drink before getting onto the train. By the time the train off, we were the only people in the compartment, so I knew we would have about 20 mins alone before we would have to get off the train.

 

I got closer to Davina, and started to rub her legs as I kissed her, my hand was moving further up her skirt, I thought to my self, my second pussy today, but before I got to it, she stopped me, saying she was a virgin, and wanted to tale things slower. By now my cock was hard and I knew she could see it through my trousers. She turned to kiss me again, then I felt her hand on my leg and I felt it get closer to my cock. She then undid my zip, and slid her fingers into my trousers. I could feel her fingers touch my cock through my pants. I thought to myself, that I was about to cum, when she suddenly pulled her hand away.

 

Davina moved to the seat opposite me, before saying, I cant do this. When I asked what she meant, she said she was sorry, then pulled up her skirt, opened her legs, exposing a pair of panties with a big cock in it, then took off her wig. Dave was sitting opposite me, dressed as a woman, Davina was Dave !!!