"Runt, I might regret this later, but I... I want to stay human."
Runt pulled out fighting the urge to transform, reverting back to his human form slowly, a surprised, "Oh?" escaped his lips and he looked bemused.
"Don't get me wrong, I'm enticed but don't want to be here until the end of humanity." I turned burning with more lust than I ever remember feeling before, I put my hand on Runt's chest and pushed him against the wall with sudden lustful ferocity. Putting my face close to his ear I whispered sensuously, "Though, I also like the idea of transforming with you... Myself, and maybe even others!" With that I whipped my face to the other side of his head and bit down on his neck playfully but hard... he is a demon after all.
Runt cried out in surprise and pleasure, he quivered as he ejaculated, spewing his hot seed onto my chest and abdomen as I began suckling his neck. I moved toward his face on a lust-induced autopilot and began grinding on him, too horny to care that I was making his penis grind against me. I wasn't thinking about what I was doing and if not under the thrall of his magnetism and already turned on, I'd never act anything like this. But I was.
My mouth found his, suppressing his moans but surprising him again, I could tell because he let out a squeak. With my enhanced form, I was taller and unfamiliar with this kind of interaction; I bent over to kiss him instead of crouching, which pulled my penis away from the little stimulation it was getting. I bent my knees bringing my body against his once again, and slowly rose up, sliding my penis up his legs and plowing into his taint which then slid into the crevice formed by his legs toward his anus. I cried out with the sudden explosion of stimulation and began thrusting with vigorous abandon. Runt whimpered and shuddered as I grunted like a beast.
Impossible in my former form, I easily lifted Runt who wrapped his legs around my waist and I continued my gyrations. Unaware and unquestioning how the anatomy lined up, Runt leaned back I felt myself plunge into him and we both groaned in pleasure. He may have made a taint cunt for me or moved his asshole, I didn't care. I felt myself building to climax and without realizing tightened my grip on Runts ribs till I was white-knuckling him. Runt had never stopped his ejaculation fountain but he squealed again and the next load splattered across my face. Three pumps later and I roared as I finally came and Runts final spurts became a dribble...
We were both panting heavily and I stumbled to the bed setting Runt down and collapsing to the side. For the first time since we had met, it was quiet for a moment.
A moment later, "Well good on you, took a sex demon by surprise and got me to go off first... that's unusual. A first for me, actually." Runt said breaking the silence. "It just goes to show that once you wind people up, ya never know what yer gonna get!"
"Ugh, yeah," I grunted feeling hot.
Runt looked at me strangely, "Oh, well... " he chuckled, "I don't want you to freak out but it looks like you get the best of both worlds, and I mean that literally."
"What do you mean?" I asked suddenly uncomfortable and irritated.
"Well, you get to keep your humanity, but try out being a demon for a while. Ain't dat great?"
"What did you DO?" I cried feeling my skull as two tiny horns protruded and a strange sensation beneath me erupted and I knew I now had a tail.
"Now, now. this wasn't me, well I was the only demon here but, you played a role too... Refocusing, only one of my forms can transfer my demonic essence and I hadn't fully transformed out of it when you, got and kept me going... so you ended up absorbing it through your skin. Which is new news to me. Not to worry though, you already rejected becoming demonic so your body will revert back to fully human over time. Probably. Just don't go saying something silly like 'I want to be a demon.'"
You touched your skin realizing there was no remnant of his semen. "But I DO WANT to be a demon, I just want to ascend beyond earth, more! It was a really hard decision and now you're telling me I have to keep making it every second of every day?"
"Eh, basically yeah? Maybe don't say 'I accept demon-hood', we're really breaching new ground here. Most people say yes, and take longer to transform than you..." was Runt's unsatisfying reply.
"What's the normal process," I asked panicking.
"Well, they accept becoming a demon, it creates a pocket in their soul for the demonic essence which I then administer. It becomes a demonic seed, and over several days it grows large enough which then transforms them all at once into a demon forever... You don't make the pocket, there won't be a seed, you won't make demonic essence of your own, and you will turn back... Think of it like hair dye, or a spray-on tan."
"How long? What affects how long it takes to purge? How will I know it's leaving?" I asked slightly reassured.
"Did I mention I didn't know this was possible before 5 minutes ago?" Runt said. "Let's get a look at your tail, That's always been the true judge of a demon's power... My guess is that it'll shrink as you get closer to being human again."
I got up and found myself attached to my bed. When my tail sprouted it sliced through the sheet and into the mattress... once freed runt took a good look, "As I suspected. When my other children were reborn their tails reached down to the floor, your's doesn't even reach your knee."