It’s a bl were the Seme liked the Uke since he was a child and the Uke tried so hard to make the Seme touch him when he got older
I remember it’s a short one, I think like 6 chapters, both of them are childhood friends, the Seme was high schooler the Uke was in elementary, the story starts when the Uke is high schooler the Seme is older by far, I think Seme helps the Uke with his studies, and I remember also that when the Seme was in high school he confessed to his friend that he’s in love with the Uke
I think the idea is that it will fade gradually, even if she was getting rid of it, so for their ruse the power from it only needs to be dimmed. Tho honestly why his power also removed the mark I don’t know, I thought it would just hide its magic