By experience, of course

Then the tail-girl went behind her, delicately removed the plug from Angie's bottom and dripped quite a lot of some type of oily lube on her. It was cold. Angie felt very empty at the extraction but she knew it wouldn't last. Birch positioned himself behind her and pushed his way in. Her well-prepared hole offered little resistance to his entrance, even though his size stretched her even further. Angie's shocked yelp quickly turned into a series of whimpers as he **** himself about a third of the way into her still-sore hole, his girth stretching her further.

The lube did it's job amazingly well however, and there was practically no friction, just stretching and amazing, pervasive fullness as he pushed himself all the way in. Impaled to the hilt, Angie felt incredible pressure in areas of her body she'd never been consciously aware of before. Angie moaned animalistically and tried to brace herself for what would surely come next, but nothing happened. Birch just stayed perfectly still. For quite a while.

Confused and becoming increasingly sore, Angie was left to ponder her options, something she hadn't been able to do since she arrived in this strange place. For some reason the only option that seemed reasonable to her was to start fucking Birch herself, and so her first volitional act since being taken captive was to slide forward just a little bit and then cautiously push back on him. It hurt quite a bit but somehow her free will appeared to be gone again. Whenever the thought of stopping was about to enter her mind her thoughts instead became hopelessly muddled.

All she could concentrate on was fucking herself with Birch's pole, so that's what she did. Eventually she started to feel even more of a bulge building up near the base of birch's cock. At the moment it wasn't very big but it was growing fast enough that when she slid off it accidentally, it was too big for her to easily slide back inside. Frustrated, she pushed back against it, but to no avail.

Then, suddenly, Birch snapped back into action. “I knew you were a slut.” He said. “Moment I saw you. Now let's get this done.” Angie, startled and more confused than ever, was about to find out why they tied her down. Birch suddenly and roughly **** his knot inside her, stretched and lubed as she was, it still took several painful seconds to get inside. Angie found herself shaking and spasming wildly, not in any real effort to get away but more randomly.

Once inside the knot swelled even more. Birch started pounding into her with tremendous ****, and pulling back equally as hard, almost hard enough to pull the knot out but not quite, so the result was just unbearable stretching. Angie continued her spasms and Birch continued pounding her, for a brief while they were literally locked in an endurance battle. Angie fought until she had practically no energy left, but her bonds did not break and Birch hardly had to exert himself at all to hold her in place. Finally she gave up, defeated. As soon as she started to lower her head Birch reached forward and grabbed a handful of her hair, pulling her head back up, all the while continuing to rapidly bump her from behind.

Unfortunately for Angie the lubricant was starting to wear off, making Birch's thrusts hurt more and more. He paid her no regard, escalating in intensity and speed instead. The whole process eventually left Angie soaked, first with her own sweat, from both nerves and physical exertion, then with Birch's sweat, which dripped down on her and formed little puddles on her back. Her snatch was also soaked, much to her surprise considering Birch's total lack of interest in clit play and the fact that her hands were tied.

Since she couldn't touch it however, this provided an aching need rather than a source of pleasurable distraction. Next came her tears, as the pounding continued to escalate while the lube continued to fail. They flowed much more freely than they had with Rowan, owing to both the larger intrusion and the circumstances of her abduction. In fact she found the crying cathartic, it was the first time she was able to outwardly express any emotion since she had been taken. Within moments she was sobbing.

That was the trigger Birch needed to finally soak her insides. His first spurt was like nothing Angie ever felt. She could always tell when she was being cummed in and could occaisionally feel a little trickle or something, but this was like someone had stuck up a super soaker inside her. And there was a lot more where that came from. Spurt after spurt shot deeply inside her as Birch's body quaked and his cock pulsed palpably.

“Get the tail ready,” Birch called to the tail-girl who complied, grabbing some strange looking device. Birch, still cumming in spite of all reason, adjusted Angie's position so her head was flat on the bench and her bottom elevated. Angie felt the knot that held them together begin to relax just slightly, just enough so that Birch could **** it out with a tremenously painful plop. Even though she had been utterly filled with cum, the sudden withdrawal of Birch's tool left Angie feeling incredibly empty and incredibly gaped.

Birch was somehow still cumming, shooting more spurts into her gaping hole and another final blast shooting down her back and into her hair. The gaped feeling wouldn't last long however as Birch quickly pushed the base of the tail inside her. It was a really big plug, at it widest point it was even thicker than Birch's knot, so it hurt going in. It also felt very strange, warm but also somehow of plant-like. Angie was in no position to do anything but bite her lip and bear the final intrusion, so that's just what she did.

When the whole ordeal was over Birch seemed understandably exhausted. “Don't move,” He commanded Angie. “Put hymen in the cage,” he commanded the tail-girl. Then he lumbered over to the bed and collapsed.