The Second Chance Enchantment (гет)

Desperate to escape The Marauders and a shattered heart, Severus finds and invokes ancient symbols. Only to suddenly find himself in Hermione's 6th year. Dumbledore thinks they may be the legendary runes Salazar scratched into his part of the castle.
What does he do?
He becomes Muggleborn Septimus Snape, a distant relation of Severus... and while young Severus falls very quickly in love with Hermione, so does the teacher, but others are after her heart. Cormac for one, Rabastan for another.
However, what no one knows is Hermione's biggest secret that she'd carried for a long while - revealed unmaliciously by Luna Lovegood. When the revelation is out, she has to talk to McGonnagall and Poppy. Further help and support is given to her via Septimus.
Older Slytherin students have told their parents about the strange Muggleborn Gryffindor relative of Severus Snape - Septimus - who is just Severus pre-NEWTS. Of course, the Dark Lord receives word and orders Professor Snape to rope in his young relative to spy on Potter...Then a young in his thirties Dark Lord shows up with the same runes...
Can things get any more confusing?