So this is Bellatrix.
"You know the plan, Hermione?"
She sighed. If they asked that one more time, they'd get a Bat Bogey Hex their way. They'd gone over the plan at least three times a day, for the past three weeks.
"Yes, Harry. I know the plan."
The TimeTurner was fastened securely around her neck and she would start turning it, to the precise time that she'd worked out. She was to go back in time and warn James and Lily about Voldemort. She would come back the same age, due to a potion Snape had brewed for her, and she would request from him in the past.
Hermione started turning the TimeTurner, and after four hours off Turning, she let go. The world was spinning past her. She saw Sirius' Mother before she died and Kreacher maintaining number 12 Grimmauld Place. It stopped just as suddenly as it had started. She was in the lounge. The door opened, and a sixteen year old Sirius walked in. He stopped, looked her up and down, and raised his eyebrow.
"And, what is a fine young girl such as yourself doing in my lounge?"
"I, um, I'm not sure, to be honest with you." She fluttered her eyelashes for effect. It seemed that past Sirius had an affinity for girls like her.
"Well, that can be changed now, can't it?" He said, whilst walking towards her. "Now. What is your name?" "Hermione Granger. But, no need to tell me yours. I already know. Now, Sirius. Tell me, what is the date?"
To say he was bewildered was an understatement. He looked as if he had been Confunded. "It's 29th August. Are you by any chance going to Hogwarts? I'd be privileged to provide you with a room until the 1st." He winked, causing Hermione's stomach to flip. "Yes, that would be, most pleasant." She winked back at him, causing him to smirk. He took her hand and led her up a large flight of stairs to a room labelled "Sirius". She took in her surroundings and grinned. The room was huge, and had Gryffindor colours everywhere.
"Are you a Hogwarts student? I must say you don't look familiar." He stated. "No." She replied. "I'm from Beauxbatons, in France. I'm doing an exchange program with your school. There are a lot of, skills of which I'd be willing to exchange with some, particular students." She smirked. "Is that so?" He asked, a smirk playing at his lips. He stepped towards her, a small grin on his face. "So, Hermione, how about a tour of my humble abode?" He gestured around himself. Hermione nodded, smirking.
Sirius took Hermione's hand and led her up the stairs, pausing on the top floor, telling her to stay there and he'd be back in a minute. Hermione had been standing there for about a minute when a door flew open and hit her square in the nose. "Mother fucking- Wha-? Oh, Merlin. Sorry about that, I didn't mean- Oh. You're here with Sirius, right?" Hermione's nose was bleeding pretty heavily buy now, and she couldn't answer, so she nodded instead. "Ah. Here, move your hand." The young witch that had hit Hermione with the door moved her hand and healed her nose. "Thanks." She studied Hermione for a moment, and smirked. "Sirius has done well today. I'm Bellatrix, by the way."
Hermione was utterly shocked to see that this was Bellatrix Lestrange.