Undercover Auror

by xxkitkatxxo

(Previously titled "Auror Róisín Rí). Falling in love meant getting hurt, and Severus knew it from their first kiss. Neasa was the only thing in his life unconnected to Voldemort, to the Order and the Marauders – she was his chance for a fresh start, but everyone has their baggage, and Neasa was no different. OOTP, canon fic, slow burn, mild smut, love triangle.

1. Prologue

Notes:

Welcome! :)

I started writing this in 2017 and then left it alone for 5 years but now I'm finally back! Anyway this is a love story between my OC, Neasa, and Snape, but there's also some love triangle action and drama later on with Sirius.

I like writing slow burn stories and this one is no different. This will stick very closely to the timeline and canon of the book version of Order of the Phoenix. Rated M for mild sexual content. Lots of pining, mutual attraction, drama, betrayal, but eventual redemption, all the good stuff. Enjoy :)

JUNE 1996

Department of Mysteries

Just when Neasa Casey felt like she could fight the masked Death Eater no longer she heard Neville Longbottom shouting, "DUBBLEDORE!"

The shout didn't distract the Death Eater – Neasa saw over his shoulder Dumbledore descending the stairs into the Death Chamber, his face white with anger.

The other Death Eaters began to scamper when they spotted him – Alastor and Tonks were passed out on the ground, the Death Eaters attacking Remus and Shacklebolt had fled – but Sirius was still fighting Bellatrix Lestrange near the Veil on the raised dais.

Quite suddenly another Death Eater made a lunge for Neasa and she sprinted in the opposite direction, towards the steps on the dais, catching some precious few moments when he was distracted. She was halfway up when she reached for her pistol; with a weapon in each hand she finally had the advantage, and she attempted to Stun him again.

Unfortunately the Death Eater was too fast; as soon as he saw her he dashed up the dais and her Stunning Spell made a pathetic little dent in the ground where he'd been.

Bellatrix and Sirius were still chasing each other around the Veil. Neasa's hands were sweaty and she couldn't get a good grip on the handle of her pistol; her fake blonde hair had fallen in front of her eyes and she shot at random, missing and hitting the masked Death Eater in the arm, causing him to shriek in pain and crumple to the floor.

Sirius and Bellatrix hurtled towards Neasa and she ran out of their way, trying to regain her breath – she felt even dizzier, and she knew her magical core was weakening.

Sirius ducked Bellatrix's Expelliarmus – "Come on, you can do better than that!" he mocked.

She aimed again, and this time the spell hit his chest and his laughter seemed to hang still in mid-air, his shocked expression frozen as such, and he stumbled backwards, dangerously close to the misty Veil. He lost his balance and grabbed onto the stone arch, and Bellatrix raised her wand to fire again.

"Protego!" Neasa cried, but she was too late – Bellatrix's spell hit Sirius and the useless Shield Charm went up a second later. Before Neasa could concern herself with Sirius, Bellatrix rounded on her and made to attack – Neasa raised another shield but the spell broke through. Her powers were becoming so weak she couldn't fight Bellatrix with magic alone, so she raised her pistol instead, ready to fire a killing shot.

But the Death Eater she had shot earlier was too fast. Despite his bleeding arm he raised his wand at her and Stunned her before she could fire, and she was thrown back against the far wall, unconscious before her pistol and wand clattered to the floor.