My favorite book is “Angel” It’s from the Maximum Ride series,

When Fang leaves the flock to make a new one, Max is heart broken, then this new boy Dylan comes into her life, he was made for Max but even though she doesn’t like him she finds herself letting him hold her, she once was about to say to him “I love you” but stopped herself. Fang is making a new flock, but then he invited Max’s clone Maya he then wants to regret it, since Maya looks so much like Max and he really doesn’t want to see her again.

Now they both are leaders and both have to wipe out the human race to save the world! Dylan is a very good sport but Max tends to yell at him a lot and now he doesn’t like his life.