Disclaimer: I do not own Harry Potter, I don't have that much skill. But JK does =)
Bellatrix Lestrange dropped the book she was holding on the table in front of her 10 year old daughter. It was 'The Rise and fall of the Dark Arts' in a bad condition. Alya Lestrange looked up at her mother in confusion.
"The Dark Lord is coming in this room in five minutes. You are to greet him in a respected manner, keep your head bowed and you are to leave with Severus Snape without the slightest movement of disrespect, Bellatrix said firmly while grabbing her daughter's cheeks with her hand, "Got it?
Alya nodded, piled up all her books in her hand and stood up when Voldemort entered the library. She bowed her head to the Dark Lord and mumbled, "Good Morrow, Dark Lord." Voldemort approached Alya and he placed his hand under her chin to raise her head. Voldemort looked in her blue eyes and she quickly looked away, knowing that holding eye contact with a person who is superior to one, is disrespectful. Voldemort dismissed Alya and she walked towards the exit of the library, where Severus Snape was waiting for Alya, holding a rather large cauldron.
"The Dark Lord didn't wait for me to place my potion into vials, so I took it with me," Severus answered her questioning look.
They were heading down the Lestrange Manor's flight of stairs. What was oblivious to Snape was that, like Hogwarts, the Lestrange stairs also has one of the 'tricky' steps. Alya, ahead of Snape, jumped down the second last step.
"Watch ou-," Alya tried to yell. Unfortunately, it was too late and Snape's foot got stuck in the step and left the thick, liquid flying in Alya's direction. She wasn't able to move out of the way so she was hit with the cauldron on her head and all the liquid poured down on her body. She glowed for a moment but it went away after ten seconds.
Alya was shell-shocked and Snape was struggling to keep is composer.
"Sir, could you tell me what that potion was?" She rubbed her skull to massage where the cauldron hit. It is certain that it will leave a bump.
Snape ignored the question, "Who is the last person you touched or touched you?"
"The Dark Lord, sir", not seeing the problem yet.
"Come with me, Lestrange." Snape grabbed her arm and walked towards the Lestrange's Potion Laboratories. "You were hit with a Bonding Potion," he closed the door behind him and sat down on a stool and directed Alya to do the same. "The Bonding Potion is a potion that if someone touches it, they will receive the qualities of whoever might've touched them last. In your case it is Lord Voldemort." Alya sat there with her mouth open. She stood up and started to pace back and forth without making eye contact with Snape.
"Qualities, you said?"
"Uh… yes. Your eyes as example, they were blue before and the Dark Lord's are red. Mixed together, you now have violet eyes. Though that appears to be the only physical change, I'm not certain about your magical core – you might possibly be stronger, more intelligent or gain darker fantasies. You are going to find out yourself."