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You've got a very nice style of prose. I can feel the musicality permeating the story, because you've got Counting Stars as a constant through line, you've got Synesthesia and Perfect Pitch, you begin and end on a C#, you've got the constant description of notes and keys (Sci-Twi's a G#m7, I'm assuming you knew that already), and I think the title's inspired by Signed, Sealed Delivered (I'm Yours), but I could be wrong. Not only that, but you've got a great grasp on contrasts -- "they've already made out and I've only just made amends" feels like a line ripped out of a Bond film, in a sincere sort of way, it's a nice play on language.

Speaking of Rem, you handled that whole dynamic well. I love that they're similar in temperament and personality to EQG 1 Sunset Shimmer, but that it's for an incredibly different reason. I also love that Rem and Sci-Twi had a history prior (the flashback was short and sweet, but it added a lot of depth to Rem for me), and that Rem isn't some terrible secret Twilight had to kinda hide away, they just drifted apart. It raises a lot of implications about how much Sci-Twi has kinda conflated the two in her head -- that box made it to Rem's house for a reason. Or did she think they were the same person this whole time? Either way, it speaks to Twilight's intelligence that she near-immediately figures out what's going on.

More of a tangent, but you've managed the impossible in writing a misunderstanding / miscommunication story where I don't want to bash either character over the head, because they're not being unrealistically dumb. I suppose that's more to do with Rem's vent session than anything -- it feels like Rem's still holding stuff back in spite of letting everything out, and that feels realistic.

Essentially, I want to see more of this world and unpack the history, because it just feels like there's a lot of stories waiting to be told. It's all around, a great story.

Thanks for favoriting Signed, Sealed, Sent! Could I poke around and ask why?