"Always" - Snape and Lily fanfic

Severus spied on them every single day when they went to the playground near his house. He finally told her what she was. Then, they were the best of friends. Time moves on and their friendship was slightly damaged. Lily did not like Severus's Death-Eater friends and Severus did not like Lily hanging out with James. What will happen to their friendship? Love or death?