Tattoo
"I don't think there is anything I love enough to get on my body for the next 50 years."
He knew she was lying. She was a good actress, but she couldn't lie to him. He was her best friend, more than that, she was his diva. And one thing he knew was how to recognise a diva's show face. He also had a sneaking suspicion of what the tattoo was. She could pretend all she wanted, but he knew it had something to do with his brother. Kurt just hoped she'd done it in a classy way, he'd seen all those photos on the internet of tattoos of faces that went horribly wrong.
Even Santana knew something was up. For the last couple of week Rachel had been super careful about not changing in front of either of her roommates. I mean, Santana was into girls, but that had never bothered Rachel before. Obviously Kurt wasn't particularly interested in seeing her naked. Santana started to worry when she realised that Rachel was disappearing into the bathroom for long periods of time, and acting suspicious when she exited. Rachel seemed to always have a large (fake) smile on her face, but she had constant bags under her eyes (which were often very bloodshot), and the small girl seemed thinner and paler than usual.
Obviously they didn't expect her to forget about Finn overnight, but Rachel barely talked. Kurt couldn't remember the last time she ate. She always said the same thing, "I'm fine." If there was one thing Kurt had learnt about females in his lifetime, it was that whenever you hear that sentence, you should be worried. Kurt was still mourning Finn too, but Rachel seemed to have died with him.
They had discussed calling the other members of the glee club. Puck always seemed to be able to cheer Rachel up and Brittany always lightened everyone's day. Rachel heard them discussing this and started an argument, which involved them promising not to at 4 am in the pouring rain at central park, where she'd been since she left their apartment in a strop at 11. They decided that surely she must be recovering slightly if she could still do her famous Rachel storm out.
Santana had her own suspicions about Rachel. Suspicions she prayed weren't true. But she had no evidence for these and she knew Rachel would hate her for mentioning them to Kurt.
One day, Rachel seemed to be taking a particularly long time in the bathroom. Kurt was at class, so Santana was on her own with her grieving friend. She knocked on the bathroom door, "Rach, can I come in?"
There was no reply from Rachel, so Santana decided that she couldn't risk waiting any longer. Rachel's life could depend on it. "Please don't let there be any blood" she whispered under her breath as she cracked open the door.
Thankfully, Santana's wish came true. What she saw was better, not good by any stretch of the imagination, but better. Rachel was curled up in a ball on the hard floor; she'd obviously been crying and had passed out there. Santana thanked Sue for making her work so hard at Cheerios practice, so she was capable of lifting Rachel and carrying her to their sofa. Kurt was due back any minute; they'd handle this all together.
When Kurt arrived home, the noise of their apartment door closing woke Rachel. She was confused to find both Santana and Kurt staring at her worriedly. Without saying anything, she lifted up the bottom of her shirt, just enough so the others could see her tattoo.
"You know you didn't have to keep this a secret, Diva. We're here for you." Exclaimed Santana.
The three of them fell asleep together on that sofa, crying together and all helping each other. When they woke up, all three felt just a little bit better.