I had either kicked the sheet off or it had been pulled off because someone (or something) was seated on my middle riding me like a race horse! She ha... her head thrown back as if she were in the throes of a gigantic orgasm and the way her vagina was clutching me as she rode up and down I would be joining her momentarily. The problem was (Waking up with some lovely female riding your dick isn't really a problem, it's a pleasure.) I could see through her! I could see my chest-of-drawers when. “Or do want to put that erection to good use?”“You mean I can fuck her?!?”, he asked, his eyes as big as saucers. “Well, what else are you going to do with that big dick?”He knelt closer to her, and took his prick in his right hand, pointing it like an arrow at her dripping snatch.“Slowly, big fella”, I advised. “Ease it in slowly.”I watched as her pushed the throbbing purple head of his cock against her slippery lips. He slid forward, and immediately plunged the entire length deep inside her.. Why, I don't know. She sort of simply came to my attention. There was nothing spectacular about her - pretty rather than beautiful, maybe a bit taller than average, and not looking particularly good in those awful plastic glasses you have to wear to keep stuff out of your eyes.She didn't even notice me, directly opposite her at the lab bench. She was concentrating on what she was doing. I, on the other hand, found these sorts of practicals far too easy, so my attention frequently wandered.. I replied ” I came for just inviting and not to collect money” by stealing the glimpse of her cleavage which was looking sexy with her chain falling in the valley which was made by two huge melons.She felt bad for her wrong guess and said ” oh sorry, please come in and what are all programs are being held ?” she said with some anxiety. I said there were dance programs, comedy skits, etc closing with cake cutting.While saying this I was seeing her huge ass which was swaying and it got struck to.