In fact, it is a collection of letters between Alphard and Tom, similar to "Loving You Like Loving Life" by Wang Xiaobo and Li Yinhe? Probably, but it's quite different from JK Rowling's original work. Although it is a collection of letters, you can also read it as a novel. In addition to the letters between the two people, there will also be some extra chapters.
Regarding Alphard, his full name is Alphard Black, the brother of Sirius's mother Walburga. In the original work, he was removed from the family for "supporting his runaway nephew (should be Sirius)". There are not many things about him in the original novel, so I wanted to use his name and identity to give Tom a person who loves him.
The final ending is of course HE, because I hope, Tom, you can really be happy.