Disclaimer: I don't own Fault in Our Stars

Dr. Maria sat with Hazel and her parents. She spoke gently to them.

"I'm afraid that the treatment is no longer working," she said, "Hazel will need a double lung transplant in a matter of a few days."

"Do the lungs need to come from the same person," Frannie asked.

"No. But it needs to be an exact tissue type," Dr. Maria replied.

"I'm an exact tissue type," Frannie said.

"Yes. Gus is an exact tissue type too," Dr. Maria revealed.

"But it would be really painful for you all," Hazel pointed out weakly.

"We've all had pain before," Frannie pointed out, "It's worth it for you to survive."

Hazel nodded numbly. Her mind was blank. She could barely think.

When Gus got to the hospital to visit Hazel he found Hazel asleep. Hazel's mom held one of her hands. Her dad stroked her hair.

"Gus," Frannie said, "I'm glad you're here. We need you to do us a small favor."

"Sure. What?" Gus asked.

"Well, it's not exactly small," Dr. Maria said.

"Hazel's treatment stopped working," Hazel's dad explained, "She needs a double lung transplant. Dr. Maria told us that you would be an exact match for her and her mom would be another exact match for her. I'm only a partial match and she needs an exact one. We would never be asking such a thing if the situation weren't so desperate but-"

"How soon can it be done," Gus asked Dr. Maria.

"We can have it done tomorrow," Dr. Maria replied.

"Great," Gus replied.

"You can't eat after nine tonight," Dr. Maria told him.

"Not a problem," Gus replied.

The next day Frannie was taken into one operating room. Gus was taken into a second operating room and Hazel into a third one. They would all stay in Hazel's room while they recovered. Dr. Maria arranged that. Frannie's left lung was taken out. Gus's right lung was taken out. They were then closed up. Hazel was opened up. Her diseased lungs were taken out and the healthy lungs were put in. She too was closed up. Three hours later they all woke up in recovery.

The first week Hazel mostly slept. Learning to use her new lungs was very tiring. She was exhausted most of the time. The second week something changed. She had more energy. She was feeling much better. By the third week, they had told Frannie she was ready to go home, but she refused to leave without Hazel. Gus had the same attitude. Finally, 4 weeks later Hazel was released.

"Gus," Isaac asked, "What's it like… breathing with only one lung?"

"It doesn't feel any different than breathing with two," Gus replied.

"Does it still hurt," Isaac asked.

"I still have to take a pill every once in awhile," Gus replied, "But it's worth it. I love Hazel Grace. Love means never having to say goodbye."