Bellatrix infiltrates Hogwarts but can she fit in and go undetected? This is my first Harry Potter story and I wanted to try something a little different. I haven't gone back to read the books or watch the movies in quite a while. This will be AU, some changes to characters and timeline but for the most part the Potterverse. No slash in the first chapter but a hint at what is to come between Bellatrix and Ginny. Please tell me what you think. Sexual content and later chapters so be warned.

It was a brand new year at Hogwart's School of Witchcraft and Wizardry and a new teacher was on her way to her classroom. Miss Cleo Mandrake, real name Bellatrix Lestrange, she was infiltrating the school for Voldemort and no one was any the wiser. It wasn't like she had much of a disguise really but luckily no one knew her directly. She was assigned to Gryffindor when she'd much rather be in Slytherin house.

"What am I even teaching in this place?" She questioned as she rummaged through the desk of the previous professor who disappeared under mysterious circumstances. She wasn't one to plan ahead or put very much thought in any plan, she wasn't even exactly sure who or what she was looking out for. Mainly she was intended to be the eyes and ears inside, on top of pretending to be one of the sorry saps working here. "Potion theory? Well that ought to be easy. These Hogwart's brats don't know anything, they'd believe everything I tell them."

She sifted through old texts, nothing interested her but it was school work after all. She was hoping there might be something useful to her in case she was ganged up on or felt like torturing someone for fun.

"Pardon me, Miss, but are you the new Potion theory instructor?"

She saw this young girl about 17 or 18, proper posture and by the looks of it a busy body. Of course Bellatrix needed to play along. "Yes. I am Cleo...," This was terrible, she was there only five minutes and already she forgot what name she was using, "...Man...drake. Cleo Mandrake. Who might you be, young lady?"

The girl acted skeptical at first, arching an eyebrow and looking over this strange woman but quickly smiled greeted her with a singing voice, "Hermione Granger."

"Granger is it? Hm," she smirked and walked up to her, fiddling with her wand. She looked Hermione up and down, "Miss Granger, are you hoping that coming here, seeing me will in some way improve your grade?"

Hermione was startled by this accusation, "No, Miss Mandrake, I wouldn't dream of doing such a thing!"

Bellatrix got closer forcing Hermione to back out into the hall, "You know, I had a lot of trouble at my old school, I had students get on my good side only for them to steal from behind my back!"

Hermione's jaw was hanging wide open, "I-I would never..."

"You lot have a point system don't you? You don't want to be responsible for Gryffindor losing 100 points!? Then off with you!"

Hermione had never been yelled at like that before by any adult at the school, maybe Snape but not at this degree. Bellatrix watched her scurry down the hall; she loved playing with emotions.

Although she thought she had at least one student off her back, Bellatrix Lestrange really had no idea what she was in for. Her first day was filled with mayhem and chaos. She grew tired of students asking questions or talking over her, shooting spit balls. She was teaching children from 13 and up, she knew she could slack off a little but needed to show some control of the room. Next she had a group that must've been in their latest year but she still had to bear through juvenile behaviour from them.

The worst was when she demonstrated mixing potions for plant growth. A hand shot up near the front of the seats.

"What is it, Miss Granger?" Bellatrix sighed.

"You know you shouldn't mix those together..."

"I think I know what I'm doing!"

"But, Miss, it's like a bom..."

"Shush!" She combined the chemicals into her small cauldron and recieved an instant blast to the face, dodging out of the way just in time with only a bit of soot covering her. She coughed long and hard as the room filled with black smoke. Class was dismissed. She still had one more class which she dreaded but knew she had to endure.

The next class of students about the same ages as the last was a little rowdy but luckily she intimidated a great deal of them. A young redhead shushed some students every so often for talking or goofing off. She was relieved once the day ended. She felt like having a stiff drink but didn't want to go very far to get it.

She leaned over her desk when she heard a soft voice from behind her, "Miss!"

She spun around quickly and had to look down to see who the voice belonged to. Young Ginny Weasley, red hair, short for her age, pretty and very straightforward and to the point.

Bellatrix was taken off guard by how close she was, she just sneaked up behind her without making a sound. "What...uh...can I do for you?"

"Ginny. Ginny Weasley," she proclaimed as she did a curtsey. "I just wanted to apologize on behalf of the class. I tried shutting a few of them up."

"Right...um, thank you. Now be on your w..."

"Can I say you have a very elegant perfume," she said leaning in to sniff her. Bellatrix was growing uncomfortable with this one, she'd much prefer dealing with Hermione Granger. "Yes, intoxicating. Do you need any help cleaning up?"

"No! No! I am fine!" She urged. Ginny just stood there smiling up at her. "You should be on your way!"

"Alright then. I will see you tomorrow, Miss!"

She ran off with a spring in her step. This girl, no more than five feet. with slender build really got to her. She was intimidating, unpredictable, something Bellatrix had no use for. She was...strange but much stranger than any girl she had ever encountered.

Update coming soon!