Thirteen stared as Cameron entered the room with dark brown hair, as did everyone else. "You're a brunette again" House cracked. "Was being a blonde making you feel stupid?"

Cameron rolled her eyes. "Why am I here?"

House handed her a file. "Amara King, 18."

Cameron frowned. "I treated her for a spiral fracture of the ulna she sustained while ice skating this morning."

"Did she mention hitting her head or any dizziness prior to the fall?" House questioned. Cameron shook her head.

"I asked, she said no."

"She was admitted with a sub-arachnoid haemorrhage about half an hour ago." Thirteen chipped in.

"Nothing to suggest a head injury?" Cameron questioned, looking over the admittance paper.

"Nope." Taub announced.

"So why am I here again?" Cameron asked. She crossed her arms and eyed House.

"You don't want to follow through, let the patient know you care?" He made false puppy-dog eyes at her.

Cameron sighed. "Well, I'm here now." She wandered over to the counter to pour herself a cup of coffee and took a seat beside Thirteen. "It seems unlikely that the haemorrhage would occur spontaneously so close to her previous injury. The fall could have been a symptom."

Thirteen nodded, agreeing. "Maybe loss of balance due to hemiparesis. Her mom had just gotten her home when she collapsed, so the time span would fit."

House nodded. "Okay, but you're missing the point. Why is a healthy 18 year old with no medical history having a subarachnoid haemorrhage in the first place?"

"Blood disorder, Cocaine abuse, cerebral aneurism…" Thirteen paused. "There are plenty of fairly obvious reasons. Why are we taking this case? I don't see the interest for you."

"We're doctors, Thirteen. It's what we do." House informed her.

"So….Cuddy made you?" Cameron guessed.

House shrugged. "You and Thirteen run blood samples. Taub, find out if she's been taking cocaine. Kutner and Foreman, you're in charge of searching the patient's house." They went off, sighing, to do their various chores.

"You don't have to stay, you know" Thirteen commented as they ran through samples of the patient's blood.

"It's fine." Cameron shook her head. "He's right. She was my patient. Thanks though." She smiled briefly at the other woman.

Thirteen sighed. "Well, I'm not finding anything unusual."

Cameron looked up from her microscope. "Me neither. I'll just test the patient's clotting time and then I think we're done here."

"Okay."

"The patient has an irregular clotting time." Cameron announced as she walked into House's office.

Thirteen frowned. "There was nothing in her blood tests to explain that."

"Nothing irregular at the house either." Foreman pointed out.

"It's not dangerously long, but it could be enough to explain the haemorrhage." Cameron replied.

"But she isn't taking anticoagulants, and if there's nothing on her blood tests…" Kutner put in.

Thirteen pondered for a moment. "What if she's self medicating?" she questioned.

"With what?" Cameron questioned.

"Well, aspirin can act as an anticoagulant, for example. And it's a pretty normal thing to find lying around the house." Thirteen pointed out.

"It would take a fair amount of aspirin on a regular basis to change her clotting time this much." Cameron argued.

Thirteen shrugged. "No harm in checking." Cameron nodded in agreement, looking to House.

"Do it." He motioned the two of them out of the room.

"Amara?" Thirteen squeezed the sleeping girl's shoulder gently. Her eyes fluttered open.

"Yes, Dr. Hadley?" she questioned, sitting up and smiling at the two of them.

"Do you by any chance take aspirin on a regular basis?" Thirteen questioned.

Amara nodded. "I get migraines."

"Often?" Cameron jumped in.

The girl looked up at her, surprised. "Every few days."

Dr. Cameron nodded. "You were right." She looked over at Thirteen, smiling softly.

The girl looked between them. "About what?"

"We think your regular use of aspirin might be thinning your blood, leading to the subarachnoid bleeding that happened yesterday." Thirteen explained.

"But now we know why you were taking so much, we can get you a prescription medication for your migraines so it won't happen again." Cameron finished.

The girl looked down at her bed. "I didn't realise…"

"Most people don't." Cameron cut her off, reassuring her. "We'll have to keep you here for recovery, but then we can give you a prescription for the migraines and you'll be out of the hospital." She smiled at the younger woman.

"Okay." Amara smiled back at her. "Thanks"

"No problem." Thirteen replied, leaving the room. Cameron followed behind her.

"Ugh. I can't believe I have a shift starting in a few hours." She stretched her arms behind her back and yawned.

"At least this case is solved so you can sleep till then." Thirteen pointed out, slowing down to walk beside the other doctor.

"Mmm…Yeah." Cameron nodded.

"I like your hair that colour, by the way." Thirteen commented, eying the shiny mass that was tumbling down Cameron's back.

Cameron blushed. "Thanks. I can only handle being blonde for so long." She admitted.

"House's comments getting to you?" Thirteen joked.

"Nah. I just…like my hair brown."

Thirteen shrugged. "'Kay, well I should go tell House we got this thing figured out."

"And I seriously need some sleep. I'll be in one of the on-call rooms if you need anything." Cameron started wandering off down the hallway.

"And what would I need you for, Dr. Cameron?" Thirteen quipped, raising her eyebrows at the doctor's back before realising the implication of her words. She had completely forgotten about the bet.

Cameron paused and turned to face the rather stunned Dr. Hadley. A smirk made its way across her face. "You never know." She replied ambiguously. "Night, Thirteen." She turned and continued her walk down the hallway.

Thirteen stood, confused, for a moment before walking rapidly in the opposite direction towards House's office. If she wasn't mistaken, Cameron had just been flirting with her.