The Alpha Pack - Part Two

Waking up with a muscular alpha hugging him like a teddy bear, sleepily f*cking into the space between his thighs with his giant cock, is not how Sam thought he'd be spending his Sunday morning.
But here is is.
It's the first day of his new life with the alpha pack, and he couldn't be more nervous. He has no idea what they have in store for him, and the uncertainty is terrifying.
All he can do is hope for the best.

Jack wants Sam to be happy, and he's determined to show him that he has nothing to fear from the pack...

(This 12,000 word story is part two of a six part serial. It features an inexperienced omega who finds himself mated to a group of kinky alphas. It contains BDSM, knotting, rough sex, pain-play, domination, leather worship and much more. Do not read if any of these kinks bother you!)
***

Jack closed the visor on his helmet and leaned forward. The move showed off the top of his muscular ass, and Sam couldn’t help but stare. He swallowed the drool pooling in his mouth, bearing down on the plug in his ass as his cock pressed against the front of his jeans.

He was so horny.

"Get on," Jack instructed, scooting forward a little. Sam climbed on, nowhere near as graceful as Jack, and hugged the alpha’s waist. Sitting down on the plug was both wonderful and excruciating.

"Nah, you’ve got to really hold on tight!" Jack laughed, grabbing Sam’s wrists and pulling him forward.

The rough handling made Sam’s cock throb, and he let out a breathy moan. Jack froze, still gripping Sam’s wrists, and Sam could hear his labored breathing coming through loud and clear in the helmet’s speakers. He ground his ass down, pushing the plug deeper and rocking it inside of him. The resulting pleasure made him groan.

Jack’s shoulders rose and fell dramatically with his harsh breathing, and his grip on Sam’s wrists grew painfully tight. After a few seconds he visibly forced himself to relax,

"You ready?" he asked, as though the air wasn’t tight with sexual tension. He positioned Sam’s arms where he wanted them and let go, bringing his hands to the handlebars.

"I think so," Sam said. He was disappointed. For a second there he’d thought Jack would bend him over the bike and f*ck him right there in the parking lot. He squeezed his arms around Jack’s waist, marveling at how broad he was...