The Struggles of a Spy

Severus' POV of Harry's first 4 years at Hogwarts. Only most significant events depicted. 1 chapter per year. Canon, with slight exception in PoA. How did Severus react to Quirrellmort? How did he feel about Harry speaking to snakes? How would things be different if had Severus known Wormtail was a spy? How did Severus feel about returning to Voldemort as a death eater? Plz R & R