I was 23 years old at the time, and had been seeing my future wife also 23 for about 3 years. I had been at work and left early to meet my girlfriend when she came home from college around 2.30 PM. I arrived a little early, and decided to knock on the door, even though I knew that she would not be home.

As I walked passed her younger 18 years old sisters window, which is next to the front door, I noticed movement.

To my surprise, she was laying on the bed, fully naked, masturbating herself. What a turn on. I couldn't peel my eyes away, and was fighting with the rising erection on my jeans. The thought of getting caught watching her was too much, as I was in full view of the neighbors, so reluctantly, I knocked on the door.

Her sister appeared, blushing, and wearing a silk night gown.

I could tell that she was still excited, as her nipples were protruding as if a cold winters day, and yet it was 85 degrees. I enquired as to her sisters where-bouts, when she told me that her sister has rung to tell her she was running about 2 hours behind schedule, and to wait there for her. I sat on the lounge opposite her, and I couldn't get the thoughts of her out of my head. She must have noticed me blushing or the enormous budge I my pants, but her legs started to part, ever so slowly. She had a wicked grin on her face. Then she dropped the bombshell. She had rigged up a mirror in her bedroom to see me watching her, and so I didn't know. I had to confess.

I told he that I couldn't help but watch her. She told me that she had watch me having sex with her sister, and wanted the same treatment I gave her. What a situation to be in.

Do I compromise my relationship with my girlfriend to be with her sister or do I turn her down? By this stage I have a full view of her swollen softness. The hair around it was wet and glistening.

I couldn't help myself. I groaned in wanton lust, but I declined. She said, "suit yourself" and went and turned on the TV. She then laid on the carpet in front of me.

She had her head propped up on her hands and her short gown was only just covering her arse.

Slowly, one on her hands disappeared under her gown, and with that her arse started to rise and my view of her just got incredible. She hit the mute button on the TV, and started to whimper and talking dirty to me. She asked me if I knew how hot she was, and how she liked it best in this position.

I couldn't take any more. I nearly hurdled the coffee table that was in my way, and she responded by pushing her arse so high in the air that in no time flat, my tongue was exploring her softness, and feverishly lapping at her personal placeoris.

This turned her wild, she had her first orgasm after only a few minutes, but begged me to continue. The next shock wave hit her a couple of minutes later. I have never seen a softness so engrossed and wet since that day. She nearly ripped my pants in the rush to get my length out. It sprung to attention, and she gave me another wicked smile. Pre-cum oozed out of the purple tip, and I knew I wouldn't last long.

She said, "how would you like to get rid of you first load". I pushed it into her face, and she sucked, slurped, and gobbled me until I erupted, but she didn't stop. About 5 minutes later I was as hard as a flag pole again, thanks to her mouth and the way she had never let her personal place alone. We played hard and furiously for about 30 minutes, sweat coating both of us. To finish off she resumed the first position that had made me go nuts, with her arse high in the air. My orgasm only took a few minutes as she met my thrusts with her own, driving me deep inside her. It was so intense that it took 5 minutes to uncurl my toes. That image will haunt me every time I see her, as I married her sister. Every time I am watching TV at their house she gives me a grim and lies on the carpet in front on me. What if?