My mate is my sisters boyfriend

I've always known that I was a werewolf. I've grown up in a werewolf household, surrounded by a pack, an extremely large and powerful pack. I'm 17 and I don't usually go to boring pack meetings. I enjoy the occasional Friday night party and chilling with my friends. My family isn't top ranking and we're never 'expected' to attend any important meetings. That's why I've never gotten the chance to meet our new alpha. All I know is that his name is Alpha Kyle and he’s one of the most powerful alphas out there. Oh and that he's dating my sister. So I'll meet him soon enough.