Mirror of Erised

After the second wizarding war and revealing those memories of his love for Lily after all those times, he was again in peril of going back to the past, blaming himself once again of his betrayal to Lily and her death.
A new Transfiguration teacher recommended by Minerva that Headmaster Severus Snape isn't able to decline came to Hogwarts, the compassionate, kind and beautiful Miss Adeline Heart.
Friendship was built and grew more into what frightened him in the present. Would Severus Snape be capable to start anew, move on from his past and love again?