Rejected By My Alpha & Mated To The Alpha King

Adyn is not your normal teenage werewolf. He is stronger than his older brother, but refuses to be the next Beta after their dad steps down. He is also Bi-Sexual. 5'5' and weights 140 lbs. He has jet black hair and ice blue eyes. He has been working at the Supernatural Music Company since he was 15. He actually got asked to sign with them after a talent show that he won. He is loved and adored by just about everyone in his pack. The only ones that even give him trouble are the future Alpha and his group, but what happens on his 18th birthday when that alpha calls him in and they find out they are mates? Will he be rejected or will his alpha keep him?