The summer flew by, and before she knew it, Diana's relationship with Rob had been ongoing for 4 months; much longer than her usual flings. And their relationship had become almost exclusive.......almost. She'd had a few hookups on evenings when Rob had been busy, but her appetite had been unusually tame. She hadn't yet admitted it to herself, but the reasons for that slowdown weren't strictly confined to just being satiated, though Rob had absolutely worn her out. An emotional connection had begun to form. Diana had learned a little over 2 weeks into their "relationship" that Rob's regularly recurring absences were due to his child custody arrangement with his daughter. He was clearly devoted to his daughter, as a loving and dutiful father. That spoke greatly to her heart, though she hadn't consciously realized it.
On the occasions where Rob had been absent taking care of his daughter, where Diana had hooked up with other suitors, she had given him play-by-play accounts of the encounters when they were next together. While Rob had obviously been turned on by those accounts, she could tell that there were some emotions doing battle within him. She got the sense that her encounters were hurting him in some way. And while normally she would be cutting ties the first hint that she sensed that a guy was forming an attachment, she didn't do that this time, for reasons that weren't yet obvious to her. Without realizing it, she had begun to worry about how Rob would feel when she was with another man.
On top of that, she found that the men she had been with, after having been with Rob for awhile, weren't doing much for her. This she did realize consciously. She knew it had a lot to do with what his enormous girth did for her, but she also suspected he had loosened her up. She was left wondering if she was getting so loose that she wasn't doing as much for other men with more average-sized members. It probably didn't matter with most men, as few of them wouldn't last very long fucking a glass of warm water during their first encounter with some strange, and she hadn't let anyone fuck her more than once since she had been with Rob.
In addition to the nearly-exclusive nature of their relationship, other unusual dynamics had developed. Rob had begun making requests of her regarding outfits and grooming habits. He would ask her to wear a certain outfit from time to time, he'd told her not to shave her armpits when she mentioned that she was probably going to start doing so again, and he had asked her to let her bush grow out. He had also become more assertive, demanding even, when it came to sex.
Diana let her bush grow wider in deference to Rob's wishes, keeping it groomed in a large triangle that could be covered by her wider bikini bottoms. And she had let it grow around her cunt. Rob said he liked a hairy pussy; he liked the look, the feel, and that it retained her scent. Rob loved seeing her bush soaked with her juices and his cum. She didn't like that it hid her hood piercing, but at least the piercing could still be seen through her spandex gym shorts.
Rob had, at first, been reluctant to participate in some of the rough play and dirty talk that Diana liked. But as time went by, he started getting more and more into her game. He would regularly bruise her ass while spanking her. He often squeezed her tits so hard that he left new bruising on them, as well as leaving hickies on them and on her neck. She had gotten to where she didn't even mind having one visible on her neck when she'd go to work, which was a new thing for her. Historically she didn't like to display signs of her sexual activity at work, and she didn't like being visibly marked as somebody's property or conquest, but she had acquiesced without realizing it.
Some other abnormal practices had formed with their relationship. Rob had invited Diana to his house one night after they finished their workout, and she had accepted. Since that time, she had been going there regularly, even sleeping over on a few occasions. They had also made several visits to the firehouse where Rob worked, while out for late night runs after their workouts at the gym. During their first visit there, Diana entertained Rob and a couple of the firefighters that happened to be in the bay with a pole dance.....using the fireman's pole leading down into the bay from the upstairs sleeping quarters. During her dance, Diana had begun grinding her spandex-covered slit up and down on the pole. The firefighters left in short order, both with bulges clearly visible in the front of their pants. On one occasion Rob had fucked her on the rear bumper/platform of a fire engine, and, during their most recent visit, on a gurney, in the back of an ambulance. During the bumper fuck, Rob had placed one hand at the back of Diana's neck, and clamped the other securely over her mouth, to stifle her screams as he pounded her mercilessly. She found that to be insanely arousing, as she enjoyed being dominated and, sometimes, even choked.
The gurney fuck took things to a whole new level. After stripping her sports bra off and pulling her spandex shorts down around her ankles, Rob had spun her around to face away from him and bent Diana over the gurney, securing her hands to the side rails with some soft restraints that they had to periodically use on psychiatric or overdose patients. At first Diana was merely turned on by Rob's assertiveness. Then she became puzzled, as he opened a drawer and pulled out a packet of lubricating jelly. She knew she was sopping wet and the last thing she needed was lubricant. It didn't occur to her what Rob was doing with it until she felt the massive head of his cock pressing against her anus.
"I told you that you were never putting that monster in my ass...." she began to protest, but that was all she managed to say before Rob applied a gag to her mouth that he made with her sports bra.
Tears began rolling down her cheeks as Rob eased his massive member slowly through her back door. She started seeing stars and thought she was going to pass out by the time he was fully inserted. She had never dreamed of being able to tolerate something that big in her ass, but there he finally was. After giving Diana a few moments to acclimatize, Rob began to pull in and out; slowly, at first. Much to her amazement, Diana found herself almost immediately on the verge of her first climax. As Rob felt her tensing and heard her moans and muffled screams intensifying, he began taking longer, faster strokes, applying more lubricant as he did. By the time she reached her second orgasm, Diana found herself grinding against Rob's cock, even as the loud suctioning sounds from his heavily lubricated cock moving in and out of her ass began echoing loudly around them. Rob was so turned on that he unloaded in her ass as Diana had her third anal orgasm. Rob then slid his dick slowly out of Diana's ass and pulled her spandex shorts up to contain any escaping fluids.
Rob untied Diana's gag and turned her head to the side as he pulled it from her mouth. As he did, Diana began "You sonuvabitch....", but she was interrupted by an excruciating slap on her ass.
"Shut up, cum slut!" Rob ordered.
As angry as she had been, Diana felt strangely compelled to do as she was told. She had, after all, just experienced some of the most intense orgasms of her life. She may never be able to walk right or have control over her bowels again, but that was a helluva fucking. As Rob unfastened her wrist restraints, Diana was overcome by a wave of emotion. Her tears had been flowing from the moment Rob had entered her from behind, but now they were joined by her uncontrollable sobs. As soon as she had been freed from both restraints, she wrapped her arms around Rob's neck and began sobbing. Rob, in turn, wrapped his arms around her and held her in a gentle embrace, kissing her neck softly. After a couple of minutes, Diana pulled back slightly and then began kissing Rob, deeply, even though she continued to cry. They were both thinking this was the most messed-up experience of their respective lives, but a very deep connection formed that moment.
Once they were dressed, they climbed down from the back of the ambulance and began making their way for the door, Diana visibly hobbling as they went. Just as they were about to leave, a man in a paramedic's uniform rounded a corner at a brisk walking pace and then slid to a halt, face-to-face with Diana.
"Holy shit!" he said, looking as he had seen a ghost.
