She was stuck in a double potions lesson, bored out of her mind. They were supposed to be making a sleeping draught, but she could make that in her sleep. Looking up, she noticed that Slughorn was asleep, drooling slightly on the third year papers he was meant to be marking. Quietly, she cast a disillusionment charm on herself, and snuck to the potions cabinet. Grabbing anything she could get her hands on, she made her way back to her table and started brewing. Throwing in the gillyweed, she noticed an ominous black smoke billowing from her cauldron, and belatedly realised she never removed her disillusionment charm. That was the last thing she remembered before being blown back by the force of the exploding potion. Aching, she sat up slowly, rubbing her head.
"What in the bloody hell happened?" Blinking, she looked around, noticing everyone was staring at her. Well, not her, but another Bellatrix.
"Why hello there gorgeous" She smirked, looking herself in the eyes. After all, the only one good enough for Bellatrix was Bellatrix herself.