Answer:
I corrected some parts of your story and added some extra details. I don't know if this fits into your story but I hope this helps!
Step-by-step explanation:
It was dinnertime, and Lea had to return to her house. When she arrived at home, she was searching for her dress and entered her parent's room to see if the missing boy was there. When she opened the door, she stood paralyzed at the horrendous sight. She discovered small chunks of the missing boy's body laying on the floor, full of blood. His head was decapitated from the boy's torso and small pieces of his skin on his hand were peeled off. Blood was stained on the walls and a sharp razor was sitting on the edge of her mother's drawer. The razor was drenched with dried blood and dark black marks. She screamed with horror and silently whimpered. She kneeled, staring at the motionless body. She stayed in place for 15 minutes, shielding her eyes away from the scene. Her body was trembling and her eyes were brimming with tears.
Suddenly, she collapsed on the ground. She remained unconscious until her parents returned from work. "Lea!" her parents called. "Lea!", they shouted once again. Lea's eyes began to open and her parents sighed in relief. After 20 minutes, Lea's parents explained the whole situation to her. Lea's parents reassured her that everything is okay and that they love her.
Lea loves her parents since the day that they adopted her. She felt a special connection with them, unlike anything she has ever experienced. Lea felt a sense of uncertainty, she felt like it was unacceptable that her parents murdered the missing boy.