Weeks had passed since Diana and Mark's first encounter. She had repeatedly had "special" meetings with him. After the first one, Samantha had one of the technicians that worked for the company secretly rig a way for her to turn on Diana's intercom microphone by remote. Sammi had spent many an afternoon in the outer office, eyes focused into space, listening to the sounds of Diana using Mark for her pleasure.
Her experiment in voyeurism had unseen consequences, however; Sammi was now drooling for the chance to bed Mark. Knowing that Diana was getting to experience his luscious body over and over was driving her crazy; but she couldn't stop listening. Finally, she saw her opportunity, and was determined that Mark would be hers.
Diana was out of town, returning that evening at 11pm. Mark had to be expecting a summons from her when she returned; Samantha was going to use that to her advantage. When Mark came in at 9am, Samantha's plan was already well underway.
As he went through his mail, Mark was surprised to see an envelope with no postage, just his name. It was soft blue, one of Diana's favorite colors. He was still unsure about the way he was being treated by Diana, but she was a good lay, and that was enough for now. He smiled in anticipation as he opened the letter.
It read "The Ritz hotel, room 745, 4pm. Don't be late. Sapphire." He frowned, thinking how different this was than normal, then shrugged it off; there was nothing "normal" about the whole situation anyway. Also, with Diana out of town, he had been without sex for over a week; she had forbidden him any partners other than her. He pocketed the room key he found in the envelope.
Mark left at noon to get ready. Since their first encounter, Diana had insisted that he get a haircut, shower, and be perfectly groomed at all times for her pleasure; with her out of town, he had slacked off, and needed to clean up some. He arrived at 4pm exactly and slid into the room, expecting Diana.
What he got was... no one. He looked around the room confused, and found a wrapped box and another note on the bed. The note, on the same blue stationary, said "Use the items in the box. Sapphire." Shrugging, he unwrapped the box and opened it. Inside were a blindfold and several bands with straps and buckles, and another note. "Wrists on the headboard, ankles on the footboard, blindfold on, no clothes. Fasten both ankles and one wrist, and have the other ready. Sapphire."