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Colin pulled his fingers out and spread me again with his thumbs, pulling me open. I almost whined. “I think you’re ready,” he said, his voice startling after I’d been focused on the subtle sounds of our bodies for so long. “Let’s move over. So I don’t end up crushing you.”

He shifted off of me and pulled me onto my side, spooning up behind me again. This time when his cock pushed into that hidden space between my cheeks, there was nothing to stop the head from pressing right against my hole, slipping against the slickness, rubbing over the sensitive flesh.

“So you’re planning to knot me this time, right?” It came out like a plea, pathetically hopeful. Of course I hoped he would, I needed him to…the experiment, I needed him to or the experiment wouldn’t work.

“Yeah, Newt. I’m planning to knot you. But not until I’ve fucked you for a while. Pull your knees up.”

A while? How long was a—oh, fuck, he meantnow. He wrapped a big hand around my hip and pushed inside, a long, careful, inexorable thrust that had my mouth open in a silent cry. He filled me all the way, sending a wave of sensation through my whole torso radiating from where he’d claimed his place inside me.

And then he stopped.

“What,” I gasped. “What are you doing?”

He let go of my hip and wrapped his arm around me, letting his hand rest on my breastbone. “Nothing,” he growled in my ear. “For now, nothing. Letting you get used to me.”

“Get used to you?” How could I get used to this, this…feeling of my body not being my own? Of someone else, of Colin, making ithisown?

But I already was getting used to it. Like this was how I ought to spend my time, impaled on a long, thick cock and simply…on it. I wriggled a little. Moving my body around it felt so much different from having it move inside me. I did it again, and pushed his shaft up against my prostate.

Oh, gods.

“I’m not going to fuck you yet,” Colin said. “But I’m definitely not stopping you from fucking yourself on me.”

“I’m not—I’m not fucking myself on you.” The words felt heavy in my mouth, thick as his cock inside me. But I was fucking myself on him, I realized, rocking my body back and forth. Taking him deeper, clenching around him, shifting so that he rubbed over my prostate.

No, so thatIrubbed my prostate overhim. Like a cat in heat, putting his cock where I needed it to relieve the pressure inside me. My own cock pulsed, rigid and thick, poking straight out in front of me.

Gods, that felt so good. It felt so fucking good. I moved faster, slamming my ass back against him, whimpering with every motion.

“Yeah, just like that,” Colin murmured, holding me tighter, his fingers flexing against my collarbones. “Taking every inch of me. You can’t get enough, can you?”

I couldn’t, Icouldn’tget enough, and I needed more. He’d given me what I needed yesterday, pounding into me, calling me a slut, wrapping his hand around my throat. Why couldn’t he give it to me again? I opened my eyes, and I couldn’t see him, just the brightness of the window, my bedroom furniture, the walls. I needed him, and if I couldn’t see him, I needed him to give me…give me…I moaned, and I grabbed the hand he had on my chest, tugging it and moving it up, still frantically impaling myself on his cock.

Somewhere in the back of my head I knew this wasn’t normal. It wasn’t me, was it? This couldn’t be me, this desperate creature helpless to do anything but take a cock, but I’d lost control of my body and my mind.

“Fuck,” Colin said, low and emphatic. “Fuck, Newt…” He took the hint, wrapping his hand hard around my throat to hold me in place and pulling his hips back, making me gasp at the loss of his cock, until he slammed it back into me.

Harder and harder, again and again, his teeth worrying at the side of my neck, fangs pricking my skin. His hipbones bruised the flesh of my ass as I bounced on him, I was so hot inside, so tight, every motion of his cock pressing everywhere…his knot swelled suddenly, and he was coming in me.

It felt like every cell in my body exploded at once, muscles clenching and my own cock spilling everywhere. So wet, inside and out, and I collapsed, limp and shaking. I couldn’t quite draw a full breath with his hand compressing my airway, but I didn’t need air. I needed him holding me together so I didn’t fly apart.

Colin’s knot locked him inside me, and I felt so full I might burst.

I turned my head into the pillow and panted, my eyelids so heavy I couldn’t keep them open. That was it. I was wrung out, done, stick a fork in me. I might never move again, just stay right here, with Colin’s heavy body wrapped around mine, damp with sweat and soaked with come, stuffed full and never wanting to be empty again.

Something stroked over my neck. Colin’s tongue, licking at the marks he’d left with his teeth.

Oh shit, his teeth. “You didn’t…bite me?” I slurred. I almost couldn’t care. So what if he’d mated me. So what…only he didn’t want to mate me.

Science. We were doing this for the advancement of science.

It felt like someone had dumped a bucket of cold water over me, except…at a distance, somehow. Startling, and awful, but still not enough to get me out of the total enervation that’d settled over me.

“No biting,” Colin said, his voice rough. He licked me again, his tongue soothing away the sting. “No biting, Newt. I promise.” He lifted his head. “You need—a blood sample, right? I brought the stuff.”

I still couldn’t open my eyes. Dark was nice. Darkness, and his arms around me, and my bed. Soft, under me, no need to move.

“Later,” I mumbled.