My twin brother, Shel Phantomhive
My brother is Shel Phantomhive. He is my favorite brother. I don't like Elizabeth because she likes her brother.
My brother is mine, no one can take it away from me, even if my father and mother are dead, no one can take my brother away, not even you, Sebastian Michaelis, you want your soul, right? ! Good! I give it to you! No matter what, I will give it to you, as long as my brother is good...
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It's a bit of a short story, but the plot may be very subversive, because Qi Yi has never had the love of his parents, and he feels family affection for the first time after time travel, so he will have a strong love for his brother.
P. S. The memory disappears after time travel.