This happened last Monday morning, everyone had left the house quite early and as I was the last to leave and in no rush I decided to have a leisurely wank. So I started reading some stories from here on my phone and got some porn on the ipad. I had the sound turned up so I could hear everything whilst reading the stories and kept switching my attention backwards and forwards when I heard a noise from outside my bedroom door. I froze, lost my erection immediately and fumbled to turn off the ipad. As I did, I heard footsteps move away along the landing and into the bathroom. Shit, who the hell was still in the house? I got the answer a few minutes later when I bumped into my son's girlfriend wandered out in her bathrobe looking ever so slightly flushed. She looked at me and gave a slightly nervous smile and it was blindingly obvious that she had been outside the door long enough to know what I had been doing. Are you ok, I asked. Yes she said, I just wondered what the noises were coming from your room so I'm sorry if I disturbed you. I have absolutely no idea why I then said what I said - I'll show you what I was watching if you want. She went crimson, didn't say anything and brushed past me. I thought I'd really blown it, but she walked into my bedroom and sat on the bed. Show me please, I've never seen anything like this before. Now she's nearly 25, a very attractive blonde with an extremely pneumatic chest so I was stunned that my son and her had seemingly never watched porn together. I asked if she was sure and she nodded, so I fired up the ipad and (very naughty I know) selected a clip of a busty young blonde being well and truly shagged by an older bloke. She didn't say anything as she watched the 10 minutes or so, she sort of bit her lip and seemed to adjust how she was sitting a couple of times, but was just transfixed until he pulled out and blew his load all over the girl's face and hair. Her hand flew to her mouth and she just said Oh my God, the dirty bastard! It finished, but before she could really say or do anything I put on another clip of the same sort of thing but suggested she might like to make herself more comfortable by lying back on the bed - which she did with her bathrobe falling away from her legs as she did so. I only had on a pair of shorts and a T shirt and I just couldn't hide the fact that I had a huge tent in the front of them - not that I really tried to be honest. As the clip progressed she started to squeeze her thighs together, go redder in the face and her breath got more shallow until eventually she put her hand between her legs and began to rub her clit - slowly at first but gradually getting quicker. The movement caused the robe to fall further apart and I could now see her fantastic tits as they wobbled in time with her rubbing. I didn't want to break the spell, but I was desperate for my cock to have some attention - from me or her I just didn't care. The clip then came to an end as the guy shot his load over her and she stopped the rubbing and looked at me. Bugger, I thought, that's the end of that. Well don't just sit there, she said as she took off her robe, get your fucking cock out and fuck me now. I ripped my shorts and T shirt off and just leapt on her before she could change her mind. There was no subtlety, I plunged my cock straight in because she was soaking. As I did so she wrapped her legs round me and pulled me in tight. We soon got a great rhythm going with her thrusting up as hard as I was pounding in to her. She came like a train in no time, gasping, panting then shouting fuck me you bastard over and over again. I knew I couldn't keep the pace up for long - riding her for all I was worth, her legs round me and her tits bouncing around as I tried to keep a nipple in my mouth. I told her I was about to come and she just said - on my face - so I pulled out and sprayed a huge load all over her face, hair, neck, everywhere. I had never felt so horny - nor so exhausted. After a few minutes she got up and simply said shower before taking me by the hand to the bathroom. We got in together and I got to soap those gorgeous tits before getting my hand between her legs and playing with her clit. By the time she had finished soaping my cock he was slowly showing some signs of life again so we got out, dried each other and headed back to my bed where I went down on her and lapped away with my tongue, bringing her to another noisy orgasm. My turn she said as she turned me round and went down on my cock. It was one of the best blow jobs I've ever had - possibly because of the situation - but it didn't take long of her sucking, licking and looking me in the face before I told her I was about to come again. This time she swallowed the lot and we lay back to catch our breath and chat. It turns out my son is a bit po faced and that although she had always fancied the idea of watching porn together, he had always said no. Well you know where to find it now, I said - I know she replied with a knowing grin!