Welcome! Don't be afraid, we're quite tame, really. ;)
This was lovely! I like the twist. Usually it's Remus who feels he'll never be forgiven, and so the thought of Severus being the one who felt remorse--that's quite striking. It makes one think...and feel very, very sad. Which is a good thing! I like it when writings and such can make me feel something like that for a character.
Look forward to seeing more from you (and soon, yes?)!