panted, thrusting up his hips.
The scent of arousal was overwhelming here, pure sex and need. Alex breathed in deeply, growling with pleasure. He licked the tip of Nathan’s dick again, then opened his mouth to suck the hard, thick length further.
“Oh fuck, fuck yes,” Nathan moaned. He lifted his head briefly to look at Alex, then dropped his head back on the sheets. “More, please, come on.””
Nathan’s scent became desperate as he thrust into Alex’ mouth, and Alex let him do that before giving his dick one last lick and sitting up.
“Alex.” Nathan’s chest was rising and falling rapidly now and he looked up at Alex, confused. “Why d’you stop?”
He remained quiet for a long moment. He had to tell Nathan about knotting, it wasn’t fair not to warn him. He sat up and pushed his sweatpants down. He watched Nathan’s face closely, and knew the other man had noticed that Alex’ dick was a little different. Alex looked down himself. Since he wasn’t fully hard, the bulge at the base of his dick wasn’t completely swollen, but it was clearly visible.
Nathan pushed himself up, his legs open with Alex kneeling in between them. “Is that...” He swallowed. “Do you have a knot?””
Alex nodded. Nathan was still very aroused, but that could easily change. “Yeah, around the nights I transform,” he said. “It’s completely normal the rest of the month.” He needed Nathan to know that.
Nathan leaned closer, completely fascinated. “Wow,” he said, staring at Alex’ half-hard dick. “So if you fuck me and it swells up more...”
“We’ll be stuck together for a while,” Alex replied. Nathan was taking it well. Very well, even.
Nathan considered that. “So you’d have to slide in half-hard,” he said, “or leave the knot outside my ass.”
“Pretty much.” Alex watched Nathan still watching his dick. He was starting to feel a little awkward about it himself now. “I get it if you want to stop or ––”
Nathan held up his hand. “No, no, I didn’t say that...” He looked intrigued more than anything. “Have you ever fucked a guy with it before?”
Alex shook his head. “No, you’d be the first.” He had seen how big his knot could get when his dick was fully erect, and he was pretty sure that while it would be painful, it wouldn’t harm Nathan.
“I’d be lying if I said I wasn’t curious,” Nathan said. He looked back up at Alex. “This is such a bad idea...”
He wasn’t saying ‘no’ or looking disgusted, and Alex’ dick became harder. “I’m gonna need lube and some condoms.” He pushed his sweatpants off his feet, and swept them onto the ground with the rest of the clothes.
Nathan rolled onto his stomach and reached for his nightstand, throwing Alex a bottle of lube and a packet. “Is a condom even gonna fit around your knot?” he asked, looking at Alex expectantly.
“I’ve no idea,” Alex said. Condoms were famously made to stretch, so with some luck a knot was no problem. He opened the cap to the lube first. “First things first, though, let’s get you ready.” He grinned down, grabbing Nathan by his hips and pulling him closer.
Nathan smiled back, happy to be lying on his back in front of Alex, legs spread and waiting.
Alex immediately coated two fingers with the lube, rubbing them against each other to warm it up. He slipped in his index finger first, groaning at how easily it went in. Fuck, Nathan wasn’t going to require much preparation at this rate.
“Keep going,” Nathan murmured, his eyes closed.
He reminded himself he had to get his dick inside of Nathan before it was fully hard. That would be difficult if he had to keep looking down at Nathan, at his lean, naked body and the way Nathan was gasping as Alex inserted another finger. Nathan was still hard, his back arched in pleasure. The second finger went in with some difficulty, and Alex watched pain briefly flit across Nathan’s face. He pushed his two fingers in