Looking for titles of stories I've read

Hey guys! So I was wondering if anyone knows the title of two stories that I've read a while ago. The first story is teacher/student where Luhan is a high school student and Sehun is his chemistry teacher and he ends up adopting him because of an abusive father. The second story is kind of angsty and is about Luhan leaving EXO and sends Sehun a letter like a year later(I think? Or maybe 2 years?) telling him how he treasured their relationship and if they lived in a different time and different universe maybe they could've been together. Please let me know if you have any ideas... It's been driving me crazy these past few days!
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