Those of you who have read my previous accounts ( Stories : type in keyword : MichaelG ) will remember the gorgeous Emilia, my student fuck friend, and will also know that from time to time we fucked with the Prof and his big titted wife Sophie. It also wasn't unusual to find us having sex with the Prof's friends either; and that was happening now on a warm June evening in a rather nice hotel a few miles from our campus. Sophie hadn't told us much - except we were to meet and have sex with a mature couple who were good friends of theirs . Oh , and we were expected to have full sex with both of them. As she said that, Sophie looked me full in the face. When we went up to their hotel room we were met at the door by an attractive but somewhat nervous man in his early fifties. He introduced himself as Max and said his wife was called Katrina. They had a suite of rooms and she was in the separate bedroom. He quickly explained that this would be Katrina's first experience of group sex and that we should start with her while he would join us later. With that he opened the bedroom door and we went in. Katrina was probably in her late forties and very attractive. She had a pretty face, tied back black hair, brown eyes and long legs crossed in front of her. She did look very nervous and when Emilia sat down beside her and gently put her hand on Katrina's knee , she brushed it off and looked shocked. After waiting a while Emilia tried again, putting her arm around Katrina's shoulders and nestling her head so that she could gently kiss her neck. But this didn't work either - Katrina simply leaned back and turned her head. Something needed to be done. I slipped quietly into the bathroom and removed all my clothes. I have a big cock and with a few rubs I had a huge erection. I then returned to the bedroom. Katrina didn't hear me come in, and in a few moments I was directly in front of her with my hard cock a few inches from her face. As she turned to look, my cock twitched and pulsated before her. With a shriek she covered her face with her hands and sank back onto the bed. At that moment Emilia knelt before her, lifted her skirt and pushed aside Katrina's small black panties. Then she got to work with her expert tongue. Katrina was soon whimpering with pleasure as Emilia's head bobbed up and down with each long lick . I leaned over and started to remove the rest of Katrina's clothes. As I unclipped her bras, two beautiful tits spilled out. They weren't huge like Sophie's but they were gorgeously rounded with pink up turned nipples. I tweaked each one with my fingers and then tapped Emilia on the shoulder. When she turned round there were cunt juices all over around her mouth and her eyes showed recognition of what I was going to do. I eased between Katrina's legs and rubbed my cock up and down her cunt, then I parted the lips with one hand and slid my knob head into her cunt. Katrina groaned as I pushed half my cock up her before slowly thrusting in and out, in and out. I fucked her gently in this way until she was whimpering with pleasure. Then I gave her a hard thrust sinking my whole cock up to the hilt. And then we were off - as I pounded rapidly with my rock hard cock it lifted her off the bed with each thrust. Meanwhile Emilia had stripped naked and joined us. She leaned over and began to gently massage Katrina's breasts. Then as I continued to fuck as hard as I could, Emilia moved her hand down to rub Katrina's clit. As she raced to orgasm Katrina bucked and thrashed wildly under me and I grabbed her buttocks tightly to keep my cock in. As she came Katrina collapsed under me. I kept fucking her but slowed the pace, then I sensed someone behind me - it was Max . Suddenly I felt his hand on my balls, squeezing them gently. With that I shot a huge load of spunk into a panting Katrina. For a moment everyone was still on the bed - then Max spoke :- 'Bend over Michael, I am going to fuck you.' As I moved into position I caught the naked Emilia smiling at me.