"Butterflies are God’s proof that we can have a second life." The beauty of that quote and the coincidence that both Sam and Alex have butterfly tattoos was the main idea that drove many people to ship these two before they even met. Both have been through a great ordeal, between losing loved ones and their own personal struggles — a fresh start is just what each of them needed.
Stiles – no, the thing that’s inside him – watches her with mild interest, taking slow deliberate steps in her direction. He watches her as if she were a particularly rare breed of bug. A colourful, pretty one perhaps, one you can observe and prod to see how fast its little legs can carry it. (And then, you kill it.)