The beginning is hard to write. The Lords and Ladies of the Vala were going to give a gift. A man that has survived and deserves another chance at love and happiness, shall be allowed to come to Arda and make a life for himself, and hopefully love.
The man was a wizard from another place and time who has sacrificed much for his home, love and life. He has good qualities and his guilt should be no more as nothing was ever his fault nor could be stopped.
This man was Severus Snape and the Valar decided that they would bring him and teach him. He in turn would teach and thrive again.
I am tired so I will write no further but if you have ideas on who Severus should date or have sex with, or married to give me your ideas over the comments!