(author's note... this story is more D/s than BDSM, but Literotica has no such category... also I think it's fine as a standalone story, but it was getting long, so I plan to have a sequel)
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Bethany Walters was happy with her livelihood, her health, her friends, and her body... well as much as any woman can be happy with her body. In her late twenties, she was a self-employed interior decorator, and well respected for her talents. Her business was steady, it paid well and it helped satisfy her wide streak of curiosity, seeing how other people lived. She had an annual checkup, and had been proclaimed the 'picture of health' by her doctor. Her wide circle of friends enjoyed entertaining one another, so when Bethany wasn't hosting a party, she was often attending those given by her friends.
When she looked in a full length mirror, she saw a woman with sparkling green eyes, a pert nose, and even, white teeth. Her mildly freckled face was framed by shoulder length dark hair that displayed natural soft curls. Her 34C breasts had dark roseate areolae capped by perky nipples. She knew her right tit was slightly larger than her left, but her intimate friends swore they couldn't see the difference. That was probably why they were such good friends. As her gaze traveled down her flat tummy, it came to her baby-smooth mound. A year ago, on an impulse, she'd had all her pubic hair removed by electrolysis. It was a painful, costly experience, but the results astonished her lovers. Not a trace of hair remained on her entire pubic area, the view of which she always found sexy. She even fancied that the lack of hair there made her shapely legs look just a bit longer.
So with all that happiness, what could be wrong?
It was that damn mental 'itch' that just wouldn't go away. She remembered quite clearly how it had all begun. It had started soon after she'd graduated from college. Out on her own in the big city at that time, she soon learned her starting salary wasn't enough to get an apartment of her own. So she found an ad posted by someone named 'Monica' who was looking for a roommate. They met, and seemed compatible enough, so Bethany moved in and shared half the rent and utilities.
The two women got along well, and before too long Monica introduced her current boyfriend Steve to Beth. He seemed pleasant enough, and it was obvious that he and Monica were intimate, since he often spent the night in her room, sleeping in her bed. Well, sleeping after a bout of vigorous lovemaking that was noisy enough that Beth couldn't pretend to ignore it. But she wasn't a prude, and she wasn't even jealous. Steve wasn't her type, and she was pleased that he seemed to make Monica happy. She figured that some day she'd have a boyfriend of her own, once the hectic pace of work settled down. The long hours of overtime made it difficult to socialize much in those days.
It was after one of those long stints of overtime that Beth came back late to the apartment. She didn't find Monica in the common shared spaces of the apartment, but noticed her roommate's purse was still on the counter, so she wasn't out somewhere. Also, her bedroom door was ajar. Whenever Steve was visiting, he and Monica were very careful to close that door fully, so seeing it ajar was unusual. Bethany readily admitted to herself that she was a curious person by nature -- always had been. So the position of that door caught her attention, plus the fact that she saw light in its opening.
Approaching it cautiously, Beth called out, "Monica, I'm home. Are you in bed already?" It was much earlier than Monica ever went to bed when Steve wasn't around, so she started to fear that maybe her friend was sick. Instead of a clear response, she heard a muffled 'hooo errrrr' sort of sound coming from the room. "What?" she asked. Again there was a muffled sound, this time resembling something like 'ummmm innn eeerrrr' as near as she could make out.
Timidly, she opened Monica's bedroom door. The room lights were all on, which made it simple for Beth to locate Monica. But Beth had a difficult time immediately processing what she was seeing! Monica was on top of her bed, face up, fully naked, with her ankles bound together with many loops of rope whose centers were tied with a vertical knot. Her roommate's hands were underneath her, in the small of her back, and there were many loops of rope surrounding her torso above her breasts and below them, leaving those breasts obscenely on display. The reason for the strange sounds became immediately obvious, once Beth managed to tear her gaze away from all the lush flesh on display. Monica was gagged with a cloth that had a ball of material in her open mouth, and ends that apparently tied behind her head.
Shocked, Beth blurted out, "Who did this? Are you OK?"
Monica's eyes widened as she uttered, "Ayyy ahhnnt eeek!"
Beth mentally slapped herself, muttering, "Of course you can't speak! Let me get that gag off!" Monica nodded, indicating that would be helpful.
Hastily but carefully, Beth untied the gag's knot at the back of her roommate's head, and eased the ball of material out of her mouth. Monica worked her jaw and wet her lips, and then said, "Thanks. I'm glad you're home." She smiled and added, "And yes I'm all right. Don't worry."
Somewhat befuddled, Beth felt relief wash through her, hearing that. As her anxiety ebbed, she became aware of a peculiar scent in the air. It reminded her of... of... "Oh my god!" she thought. "That sort of reminds me of what my room smells like after I play with myself!" Without thinking, she turned her head and stared at Monica's exposed pussy. Sure enough, the labia were swollen and wet with a clear-ish liquid that coated both that area and her upper inner thighs. It was definitely not the characteristic smell of semen, so this was probably not a scene of rape, nor was Monica hysterical.
Gathering her composure, Beth looked back at Monica's face. "So, are you going to tell me who did this?"
Her roommate giggled. "Steve did it as a joke. He left me here like this so that you'd find me. And don't worry, as I said. He stated that if I didn't call him by midnight, he'd come back and untie me himself, in case you hadn't shown up by then, or hadn't thought to find me."
"So you want me to untie you, right?" Beth asked, feeling that the situation was a bit surreal, hearing Monica's calm explanation.
