I am 30 yo English male has a 25yo Taiwanese girlfriend. My gf’s sister came to stay with us for a few weeks while we were living in Singapore for work. Her sister is 22yo who, I guess has not had much male experience. My gf is usually always naked around the house and knows that I am always naked around the house too, but did not expect me to do this while her sister was here; or not straight away anyway. So I wore underwear around the house, but after a shower I used to come out wearing only a towel. My gf is quite open minded, especially that she knows that I’m bi sexual. She is ok for me to go and mess around with other guys, but is not ok if its women.

I was on the sofa talking to her sister most nights after my shower wearing just a towel, but knew that she could see right up my towel, as I made every effort for her to see. I started becoming more risky by walking to the shower in the morning naked, where she could catch a glimpse of me from her room. She would pretend that she did not see me, but I knew she would look.

When my gf was at work, I would walk to the laundry naked, while her sister was in her room, and would only see me walk by and not see the full frontal. I would pretend it was normal to do this, and would make several trips.

One morning I woke up to see my gf off to work. Her sister was still sleeping. I thought this would be a great chance for her to really catch me naked. So I waited in the kitchen completely naked, pretending I hadn't heard her wake up. She came out to see me naked and paused. I just said 'good morning, would you like some breakfast' and acted normal, like it was a normal thing for me to be naked. She said ok, and I spent the morning naked, cooking her and serving her breakfast. I remained naked for about 5 hours around the house that morning. I was on the PC while she was on the sofa, just talking to her completely naked. I then joined her on the sofa, just talking. At this time, I was getting completely hard.

This went on for about 2 weeks. The whole time, she never mentioned anything about being uncomfortable or anything to her sister. One time while we were watching TV and disagreed on what we wanted to watch, we began wrestling over the remote control as a bit of a joke and I was completely naked and knowing I was rubbing all over her. During this time, I got hold of the remote, by holding her down as my legs were on each side of her with my penis only 10cm away from her face. I pretended not to look at her and was busy changing the channel. When I looked down, she was just smiling and looking at my penis. Nothing ever happened and it was never meant to be sexual, just very exciting. 

After a couple of weeks, and more confidence, I would be on the PC located in the dining room, and as most males do, I would look up some porn. lol. She would walk by and not even care about it and think that it was normal for a guy to do that. I would stroke myself a bit, but not so much that I would masturbate in front of her. I would then go to my room and masturbate with the door open, hoping that she would catch me. She would walk to her room past my room and would look straight in. I pretended not to look at her and would notice that her pauses got longer every-time she walked past. As it became a regular thing, I would notice that she would walk past more often. To the point that she began talking with me by asking me a question about masturbating while I was masturbating. After day 4, she began watching me masturbate until I finished. 

She told her sister everything about the nakedness and that was all ok, as my gf expected that from me. But she never mentioned anything about the masturbating. 

This was the most exciting 6 weeks all time for me. She then started visiting more regularly than before and is completely comfortable with me being naked around her. Her last trip she brought a friend with her - A male friend - also a 22 yo student from Taiwan. As I didn't want to change the routine, I continued the nakedness as normal. This further demonstrated to them that it was normal for us.

This was even more exciting, knowing that more people were watching me naked. At this time, I would be naked around the house while the other 3 were completely clothed. 

The difference this time was that I was to share the spare room with the male visitor and my gf and her sister were staying in our double bed. As, I didn't want to break out of routine I continued as last visits and would masturbate in the room. This time in the visibility of the male visitor. One thing that my gf’s sister didn't tell me was that he was gay. I discovered that doing this around him only excited him. So after the second time masturbating he asked if he could do it for me. Being bi-sexual, I obliged. This became one of the best gay experiences I had.

When my gf would go to work, I would stay home and have sex with him in our room with the door open. My gf’s sister was shocked at first, but also excited to watch. I think she brought him for that reason. It seems she told him all about me and he insisted on coming to Singapore. My gf knows that I am bi, but didn't expect this.

My gf’s sister told my gf of the experience and it only got better from there. After some days, we would have sex in front of both my gf and her sister. This was even more of a turn on.

So this went on until they left. We have plenty of pictures as both the ladies obliged to take them.

Thats my naked story.....