Many thanks to Jessiikaa15 for being my beta.
This is my first attempt at writing any fanfiction so please bear with me. This is an AU cannon divergence at the beginning.
"My Lord please allow me to follow as witness to your victory over the Potters."
"Very well," the Dark Lord sneered. As he cast his eyes over his prostrate follower he continued. "If you dare to interfere the cost shall be your life. Stand and grab hold." With that said Voldemort side apparated his follower and appeared in front of what looked like an empty lot.
As soon as he heard the crack another wizard in pitch black robes came scurrying across the road towards him and with very few words he allowed the two other men to see what was actually in the lot. Once he was able to see the house, the Dark Lord raised his wand and with a stream of magic battered down the wards. They came crashing down with an almost inaudible rush leaving the house unprotected and a wizard with dark messy hair and light skin flung open the door almost immediately, wand drawn and a wordless stunning spell shooting off at the Dark Lord.
Stepping to the side swiftly, the Dark Lord easily dodged the spell and returned it with a flick of his wand along with a gleeful "Avada Kadavra", the bright green killing curse hitting its mark and dropping the wizard. Proceeding forward, the dark wizard stepped over the remains of James Potter and started up the stairs, heading for the nursery.
"Not Harry, please," came a futile plea from a witch blocking the Dark Lords path.
"Stand aside and I won't harm you." The Dark Lord commanded but to no avail, the woman was still in the way so he raised his wand.
"Have it your way then," the Dark Lord said as a frown crossed his face. He had not wanted to be forced into killing Lily. He had promised his follower that he would try not to harm her. He turned to the side as he glanced back at His dark haired follower. "Severus there is nothing I can do," the Dark Lord intoned.
With a gasp the witch saw past the Dark Lord and recognized her childhood friend, noticing his eyes appeared sunken and bloodshot as if he hadn't slept in weeks. Realizing that her time had come she appealed one last time, this time it was to Severus that she spoke.
"Please watch over Harry and don't let Dumbledore get him. I know that if James were still alive he would have apologized to you. I still love you as a brother." Turning to Voldemort she continued, "Kill me if you must but I will not let you get to Harry." With that said she wandlessly transfigured the closest toy into a weapon that she could attack with. Mid lunge she was met with another bright green Avada Kedavra. This time the Dark Lord had cast it without glee or anything approaching happiness. As he stepped over the body Severus could swear that he saw a tear drop from his Lords face. Quickly convincing himself that he was seeing things he covered his face to avoid watching the child die.
After a flash of bright green seared his vision through his closed eyes he looked up. As he took in the scene in front of him his jaw dropped in shock; where the Dark Lord had stood was now nothing. The baby in the crib still stood there looking at the spot where the powerful wizard had stood. On Harry's forehead was a lightning shaped scar that pulsed for a second with the now vanquished Voldemort's power. Sensing that something was off with the scar, the potions master gently wiped the little blood that had seeped from it. He had to think fast. He would be foolish to believe that this house would be empty for much longer. Taking Lily's words to heart, he picked up the child and quickly apparated to the first safe place he could think of.