I tried writing this so many different ways to make it right. Finally, I got inspired by a comment on a lyrics video for Beside You by Mariana's Trench, of all places.

(Flashback)

Terra woke up, and at first was worried when she didn't feel Beast Boy's arms around her. Then she remembered that bet she'd agreed to with him. "Spend a day without me, and I'll love you until the end of time," he had said. She had rolled her eyes at him, smiling. "Didn't you already plan on doing that?" she asked. He laughed and said simply:

"Well, yeah. But if for some stupid reason, you feel like I don't love you, just remember this as proof."

She didn't worry. She never doubted him for a second. So, the deal was set.

The geomancer rolled onto her side, and noticed a piece of paper sitting on the coffee table in the middle of the room. Even from a distance, she recognized Beast Boy's handwriting. She sat up, yawning, and made her way sleepily to the couch. She picked up the paper and started reading.

Tara,

Congratulations. You did it. I'm proud of you. You managed to make it twenty-four hours without me. Now, promise me that you'll do the same every day. This is the hardest thing in the world for me to say, and I know that it's selfish to say it in a letter, but I won't be coming home. You can ask Cyborg and Raven, they know why not. I wish I could've told you sooner. I love you so much, Tara. You're the best thing that's ever happened to me. And Is? Make sure she knows about who I was. Tell her about the team, about everything. She deserves to know. And tell her that even though I've made a lot of mistakes in life, she isn't one of them. I don't want her to know what I'm going to say next. My powers are a result of a mutation with my DNA. That means that she'll probably have some version of my powers. I'm mostly worried that she'll be in danger of losing control like I did. I was too ashamed and afraid to tell you this before, but my powers are just as uncontrollable as yours were. Probably more dangerous, too. Again, ask the rest of the team about it. I know you've always had a hard time trusting people, and I'm so glad you were able to trust me, but they're your friends. You can go to them whenever you need them. We always knew that life wasn't forever. My life has ended. Is's live has just begun. Live for her. Live for your friends. Live for yourself, Tara. You can live for anything you want. You just can't live for me anymore.

Just live. I love you.
-Garfield

There was a knock on her door, and it opened without her answering. "Terra, there's something we…" Raven's voice trailed off when she saw the letter in the Terra's hand. She turned to her goth friend, a look on her face that said "I can't believe you knew."

Raven took Terra into the common room. Cyborg looked up, and instantly knew why Terra had a steady flow of tears running down her face. Robin turned from reading the crime reports. Starfire looked up from playing with Is, her face confused and naïve.

Raven and Cyborg explained that Beast Boy had gotten suspicions about Slade's whereabouts. He had gone off on his own to find him, only to discover that Slade had gone back to his old method of nano-bots. Long story short, this new type were set to go off after a certain about of time, releasing a toxin directly into his bloodstream that would kill him within a few seconds.

Cyborg had tried to remove the nano-bots like the first time, but they were too fragile, and they would've been set off early. He was only able to discover that the time was set for one week. Seven days to live, and no way to stop it. Beast Boy had told Cyborg and Raven not to tell anyone else.

The exact time was set for midnight. That's so Slade, he thought.

Beast Boy had silently opened Terra's window with his eagle head, the letter held in his talons. He shifted back to human and placed the paper on her table, glancing over at the sleeping blonde. His stomach twisted painfully. Testing his luck, he walked over to her and lightly brushed his lips against her cheek. She murmured in her sleep and rolled onto her back, her golden hair fanning out around her, her face peaceful.

This just couldn't be easy for him.

"I'm sorry," he whispered as he slipped out the window.

He flew a few miles out to sea, finally flying low over the water and shifting back to human. he submerged under the water, coming up for air a few moments later. He turned onto his back and floated there, staring up at the clear night sky. He held his wrist up in front of his face to look at the watch he'd brought with him.

Thirty seconds, he thought. The simplicity of this was so strange. In thirty seconds, he would be dead. There was no way around it. In thirty seconds, his life would end, and then…

Twenty seconds. What was after this? Where would his mind be in twenty seconds? Would he wake up as someone or something else? Would he wake up surrounded by all the people he loved? Would he even wake up?

Ten seconds. What if there was nothing after this? What if it was just an empty void that he would remain in until time itself ended?

Five. No, that couldn't be it.

Four. Maybe it would be his version of what made him happiest.

Three. Terra's face came into his mind. Terra. His love. His world.

Two. His eyes slid closed and he let his arm fall back into the water.

One. Terra. And Is. They could keep each other safe and grounded. That would work.

Zero.

Me: *crying my eyes out while writing this* Beast Boy! I'll miss you! You're my favorite person in the whole world! *stops crying in a snap* Wait, Is, you didn't real the entire letter, did you?

Is: No..?

Me: Phew, OK.

Is: *eyes flick up to the letter*

Me: Ohhh, no you don't! You'll find out when it's right for the story!

Is: *sigh* Fine.