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He knelt on a sheet on the floor of Barbara's living room with his rump in the air while she examined his "downstairs situation" as she'd called it. He resisted the urge to squirm beneath the weight of her silent scrutiny. Imagine exposing himself in such a way, only for her to determine that this whole endeavor was for naught.

The thought alone made him itch for the simplicity of combat; at least there those who witnessed his humiliations would not survive to share them.

More seconds ticked by in silence before his discomfort won out. "Well?"

"Yup," she said, "I think this will work."

---

"This" was the result of his own foolishness. He hadn’t meant to intrude on his host’s evening that day or, having done so, to linger. But the scene in the living room--the changeling on the sofa, legs spread, and Barbara kneeling like a supplicant between them—had been too strange to ignore.

So he'd watched them, brow furrowed, trying to understand. But when their motions had ceased and Barbara had clambered up to take a more familiar position on the changeling's lap, he felt no more enlightened than he'd been at the start.

He did not enjoy ignorance. He'd turned the moment over in his mind for days, searching for an analogue for the act in his (admittedly limited) knowledge of troll mating practices and finding none. It would be too dangerous. There were teeth. And troll tongues were meant for scraping flesh from bone; no sane troll would invite one anywhere near their gronk-nuks.

What he'd seen was uniquely human, then, and he couldn't fathom how the changeling had found pleasure in it. There was, however, a way to find out.

"Your people--do they partner freely?"

"Sorry?" Barbara said, punctuating the statement with a yawn. She handed him a mug of the drink humans called coffee before turning her attention to modifying her own with a variety of powders and liquids.

"Fleshbags. Do they take multiple partners in--" he fished for the term, "sex?"

"Hoo boy. One moment," she said. She took a long swig of her coffee. Then, "Okay. So do you mean at the same time, or over the course of the relationship?"

"Relationship?"

"Ah, right. Um. Bond?"

He considered this. "Both."

"Some bonded humans do take on multiple partners, yes. Sometimes just for a night, sometimes for months or years. There are a lot of names for those kinds of relationships, but generally the former is called 'open' and the latter is called 'polyamorous.' "

"Interesting," he said.

"Why do you ask?"

He leaned against the counter; when he spoke again it was to his mug rather than her. "I wish to try a human sex practice with you."

Her cheeks took on the pink hue he'd learned was indicative of emotional distress. She made several noises that didn't graduate to actual words until finally she squeaked out, "Is this--is this about the other night?"

He looked up sharply. Taking that for the confirmation it was she continued, "We were having a date night and…didn't move things upstairs when we should have. Walt said you might have seen us…?"

While he was reluctant to give the changeling credit for anything, managing to detect him while so distracted was impressive. "He was correct."

There was a tang of fear in the air like the distress of a hunted thing now caught. She bit her lip. "Sorry."

"Apology is unnecessary. You are free to do as you wish in your home."

"Yeah, but…consent…" she shook her head slightly. "I shouldn't have done that. But I didn't expect that you would be--" she looked him over from horntips to feet; there was an appraising quality to it. "Anyway. I need to talk to Walt first. Can I get back to you?"

If the venture came down to the changeling's decision, Angor had little hope it would be approved. But now that he understood how their relationship worked, refusal might be the better outcome: for if the changeling agreed, what would he demand in return?

------

After completing her examination Barbara bade him sit. There were two objects on the floor in front of her: a clear bottle of liquid, and something that resembled an abstract phallus.

"I want to make sure you're comfortable with everything before we start," she said.

"I doubt there's anything you can do to me that I cannot endure," he said. Still, he eyed the phallus suspiciously.

"I don't want you to endure. I want you to enjoy it. So if you're not enjoying it tell me, okay?"

Consideration was a luxury Angor had never enjoyed; to be offered it so freely and often by Barbara made him feel like there was something alive and squirming in his chest. He was still unsure what to make of it. "Very well."

"Your penis--er--vamek retracts, correct?" she asked.

When he nodded she continued, "So we've got to get it to extend. I'm not a troll, obviously, so I can't emit pheromones or wrestle or any of the other things you guys would normally do to get each other 'in the mood'. So, we've got to take a shortcut."

She nodded towards his gronk-nuks. "The separation between your…racsik and vamek are thin. If I directly stimulate the former it will trigger your vamek to extend. That's what this is for."

She picked up the phallus. It was roughly the length of her forearm and as wide around as his thumb. It wobbled slightly as she held it.

"You mean to put that inside me?" he said, reeling back.

"I know it sounds weird, but trust me." She handed it to him. "We call them dildos, or sex toys. Here, it's not as stiff as it looks."

She was right; the material flexed easily in his grip. It seemed to be made of a rubber of some kind, one not too different in texture from the softer stone of his vamek.

"And here--" She squeezed some of the liquid onto his hand; it was cool and slightly viscous. "This is called lube. Well, technically lubricant, but everyone just calls it lube. When I apply some of this to the toy and you, it'll help it slide in easier."

He looked from the lube, to the toy, then to her. "This is really what you and the changeling do?"

"It is. Well, the first part anyway. The part you were interested in happens after."

His mind whirred. He'd said he could endure anything, but the thought of someone rooting around his most sensitive tissue made him want to cross his legs forever.

"Hey."

Her words startled him out of his thoughts. She was smiling gently at him. "We can stop if you want to, Angor. It's okay."

That strange, squirming thing awoke once more. "No," he said. "I trust you."

---

She didn't try and jam the dildo in right away; for that he was grateful. Instead she drizzled a little more lube over his opening and slowly massaged it into the surrounding stone with her thumbs. Nerves he'd only been dimly aware of before now crackled to attention. It was…not unpleasant.

What would it feel like to have that gentle touch inside him? But, no--that's what the dildo was for. The stiff rubber held less appeal, but perhaps driven by her skilled hands…

He was yanked from his thoughts by her thumbs skating over his ring proper. It was no accident: now she traced slow, teasing circles on the skin, and pressed gently against its resistance. He only just managed to quell the disgraceful noise that threatened to leave his throat as he arched into the contact.

She hummed. "Very good. I think you're ready."

Her touch vanished. He heard the click of the bottle of lube, followed by more of the cool substance spilling over his stone. A moment later her hand settled on his hip, and something hard and slick--the toy, he assumed--pressed against his opening.

"Breathe out," she said, "and relax."

He did as commanded. And then, she pushed.

The lube had done its work: there was no pain. Only the strangeness of the object inside him, and his body's eagerness to draw it deeper.

"Perfect," she cooed. "You're doing so well, Angor. How does it feel?"

Empty. He needed--

"More."

She obliged, entering him with almost frustrating care. He rocked back, willing her to move faster. Instead she tsked and paused.

"Patience," she said.

He grunted. "You torment me."

"I don't want to hurt you…"

"I'm not a whelp, Barbara. I don't need to be coddled."

She sighed. "Well, if you're sure."

And then, all at once, she drove the toy home.

Pleasure burst through his entire frame. He gripped the sheets, eyes wide with shock.

Barbara laughed. "Found it, did I?"

"What--" she pulled the toy back, then drove it forward again. More pleasure, hot and sharp, spilling from some point deep inside him. "What is that?"

"Prostate," she answered. "Surprisingly you guys aren't built much differently than humans. Well, minus the extra stomach and liver. And whatever a razvo is. Feels good, right?"

"Yes," he fisted the sheets in his hands so tightly that his clawtips bit into his palms. "Yes."

His body gave him no choice: he had to rut, to feel those shocks sparking from his core. And Barbara obliged, plunging the toy into him with short, quick strokes that jarred the breath from his lungs.

"Hm," she said, "looks like it's working."

And then--her grip on his vamek, squeezing. It was as she'd said: the stimulation had drawn it out. Her hand was too small to encircle it entirely but her touch was enough to complete a circuit between rear and fore, settings his nerves alight. More--a little more, and then--

She stopped.

"Why?" he snarled, twisting around to glower at her.

She smiled and shrugged one shoulder. "We can keep going if you want, but as I recall, this wasn't what you wanted to learn about today."

He'd wanted to learn…? Oh. The "oral." Yes. He swallowed. "It…is as pleasurable as that?"

"Hm. Subjective, I think. How about this: we can try, and if you don't like it, we'll go back to anal. Deal?"

The toy was still inside him, its pressure a reminder of the release that had been so near. But she was right--tonight, it was a means to a different end. And he was nothing if not patient, even now.

He sighed. "Very well."

The oral required a different position, similar to the one that had first caught his attention on that night: he lying flat, legs bent and knees spread, and Barbara kneeling between them. Foolish of him to think she'd been a supplicant before the changeling; he understood now that she held all the power in this strange territory. Though, judging by her expression as she stared at his vamek, she was uncertain of how to wield it.

"Huh," she said. "That's--big. Wow."

He frowned. "Humans are not equally equipped?"

"No! God, no. Are you kidding? That would split someone in half!"

He put care into his next question; having already erred once, he was hesitant to do so again. "You…cannot copulate with trolls, then?"

"I--" she bit her lip; it seemed she too did not wish to misstep. "I think it depends on size? Of the troll, I mean. You're--" she arced a hand high over her head, "--and some are--" she pressed downward until her hand rested at roughly hip height. "I don't have a…variety of experience, obviously, but around here--" now she drew a line at roughly the changeling's height "it seems more compatible. Don't get me wrong, it still takes a LOT of adjusting, but…"

General notes

The reproductive systems of both male and female trolls are internal and situated primarily within the pelvic cavity, accessible via an entrance on the grok-nuks.

Contrary to human interpretation, the grok-nuks are not analogous to testicles, but instead collectively refer to the critical nerves, arteries, and organs in the pelvis. Because a troll’s hide is thinnest at the pelvis—to allow for articulation of the hips, torso, and legs—the grok-nuks are their most vulnerable area, and even light trauma to them can be debilitating. See “Rule 3.”

And now onto the good stuff!

Male troll reproductive anatomy

Male trolls have no externally visible reproductive organs. Their penis is fully retractable and their testes are situated between the bladder and kidneys within their pelvis.

Testicle size varies between species; however, the size of all male troll testis increases in the months leading up to the fertile cycle. This size increase varies between individuals, but a typical range is 4-6x the base testicle size.*

Larger testes size is beneficial in mating, as bigger testis = more semen = greater chance of fertilization

Troll penises have their own wild shit going on. They:

Are often large relative to the troll’s body size, especially in subspecies where multiple males compete for a single female.

Have baculums (a free-floating bone that helps them maintain an erection)

Are retractable; they partially extend for urination and fully extend for mating. When fully retracted

Have flared heads, allowing them to scoop out the semen of other males upon withdrawal from the vagina

Are prehensile, with mobility** level correlated to size: the larger the troll species, the more dexterous their member. This feature helps compensate for difficulties trolls can face during mounting or penetration owing to their bulk and somewhat reduced mobility.

Troll seminal fluid is a little less complicated:

During a fertile cycle troll seminal fluid is watery and opaque with color ranging from light gray depending on subspecies. Outside of a fertile cycle the seminal fluid becomes transparent, indicative of an absence of sperm in the ejaculate.

Typically smells metallic

The taste varies between individuals and whether or not they’re in a cycle. As with humans, the taste can also be impacted by diet.

Female troll reproductive anatomy

Like the males, the texture of the troll vagina is reminiscent of silicone. It has a base level of lubrication at all times that increases during the fertile cycle, and further during copulation itself

The average depth of a troll’s vagina is 15” (measured from entrance to cervix), which includes an upward curve at the end

Near the cervix is a nerve bundle analogous to the clitoris; stimulating it during penetration increases relaxation of the cervix and makes it easier for sperm to access the uterus

Trolls have large uteruses to accommodate the honkin’ huge eggs they lay. Depending on subspecies, a troll egg can weigh anywhere from 10 - 30lbs.

In some subspecies the vaginal canal has switchbacks and dead ends that can be a challenge for the penis to navigate; this is a holdover from a time when the female trolls of the subspecies…had a little less choice in who their mates were, and had to rely on combative anatomy to control who actually fertilized them

Also like the males, ovulation in female trolls stops outside of the fertile cycle.

----------------------------------------------------------------------

*This dramatic size shift is due to how troll testes work: sperm production only happens during the fertile cycle, and the testicles grow to maximize the amount of sperm they can produce. After the cycle ends they enter dormancy and shrink.