I'm 18 and my sis is 17. This happened a few months ago.
You know after reading that story Caught By Sis I just had to write and tell you about my experience with my sis. It was a total surprise for me too but man was it kinda hot. We didn't walk in on each other or anything but we did end up getting naked and checking each other out.
One day she was walking down the hall between our bedrooms in her bra and panties like I've seen her a bunch of times. For some reason I just decided to make a comment on her body and said something like 'hey nice butt' and she just called me a perv and went in her room. Later she saw me in my underwear like she has a million times anyway and said 'cute ass for a lil bro' and I just laughed and really paid no attention to it. A couple days later or something I saw her in her underwear coming out of the bathroom in the morning when we were getting ready for school. I made another joke about her body and her underwear and she's said out of the blue 'hey if you wanna see it you gotta show me yours first you little perv'. Wow. Where did that come from. Was she serious? Heck I was blown away.
So later I decide to joke with her and I say 'hey I think its you that wants a look at my package and I think your the perv'. She just smirked and walked away. So one day we were watching a movie late at night and there was kind of a sex scene in it a lil and I said 'that chick has a hot body'. She said 'well it's probably the only one you'll ever see you perv'. I was joking and I just said out of nowhere 'yea unless I see yours'. She really didn't say anything and until about a half hour later she goes 'so are you saying you want to see mine'. Wow. I didn't know what to say. Finally I said 'why you feel like showing it'. She goes 'hey if you wanna see you gotta show'. Wow. I so couldn't believe if she is serious. I said 'I'll show if you will'. Anyway we started talking about it and we decided we would give each other a look and see what it was like. Man, I was getting so turned on. I think she was too.
We went up to her room and started taking off our clothes and were both down to our underwear which we've seen each other a million times. We were both nervous now I think about who was going to strip down first. So I told her if she took off her bra first then I'd take off my underwear and basically get naked first but I wasn't going to just strip first without at least seeing something. She reluctantly agreed and turned around and took it off. When she turned around to face me I was already screaming hard and I know she was a lil nervous by the way she acted. Her tits were gorgeous. She was covering up a bit with her arms but then just stood there and let me have a look and said now it was my turn to drop my underewear. I was so nervous but I decided to just go for it and just pulled off my underwear and could'nt believe I was standing there stark naked in front of my sis looking at her boobs. She was staring at my already hard cock and telling my she was surprised by how cute it looked and to turn around and show her my butt. So I let her have a look at my ass and then I said hey I think its your turn to be totally naked.
When she took off her panties I almost blew my load right there. Dang. It was so wild. My sis has a great body. She isn't totally shaven so she has a nice light brown patch of pubic hair. I could tell she was getting into looking at me too. I was amazed at how hard I was in front of my sis. We were kinda nervous at first but then like got more comfortable and really got into checking each other out. I mean we looked at everything. The ass that I had seen so many times in her underwear was just so much better naked than I would have imagined. She was so into my hard on and she wanted to feel it a lil so yea I thought that was cool. She let me feel her pubic hair and touch her ass a lil, man what a turn on. We basically hung out in her room and checked each other out for maybe 10 mins. Anyway we were both so hot by now that I couldn't take it anymore and I flat out told her I needed to jerk off. She asked if she could watch and I said well yea but are you gonna do anything or what. She said omg yea and she started touching herself too.
Before you know it we were laying on her bed and just watching each other go at it. We both came in like 30sec I think. Man it was hot. Watching her rubbing and fingering herself I shot the biggest load ever. As soon as I came she started cumming and moving her hips like crazy. Wow. So now like every once in a while when our parents aren't home we'll get together and have good lil time relieving some frustration. We both admitted that we just really get into the looking and getting turned on from it and just masturbating. We've gotten so comfortable with it now. For sure we've shown each other everything. We don't touch each other much or get too into the incest and never would but we've done this like five times already and it always gets us hot and horny.