I know that it took a while but, here is the next chapter.

Narrator's POV

The turtles started making their way back to the lair. But one perticular Turtle was panicking a little.

"Guys HURRY! We NEED to get back to the lair ASAP!" Donnie said to his brothers while panicking a little.

Mikey and Raph raised a non-existing brow.

"What's the matter D? Why are you panicking so much?" Mikey asked his purple claded brother.

"Leo is the matter! We need to get back to the lair quick before he-" Donnie stopped talking as soon as he realised what he was about to say to his brothers.

"Wait what?!" Raph said to Don.

"WHAT'S GONNA HAPPEN TO LEO?" Mikey asked Donnie slitley starting to panick now.

"Uhh- nothing nothing, nothing at all, I was just panicking a little that's all. Now let's get back to the lair." Donnie said trying not to act suspicious but failed.

Mikey and Raph looked at eachother and nodded. They both would ask Donnie what was the actual problem with Leo, but for now it would be best to listen to Don.

The turtles quickly made their way back home. A soon as they stepped into the lair Donnie rushed towards the lab, which confused and worried Raph and Mikey a lot.

Donnie opened the lab lab door and laid a hand on Leo's cheast hoping to find a pulse. He sighed in relief when he felt it.

"What's the matter, Donnatello?" Splinter asked who was sitting right next to Leo but Donnie had failed to notice him due to panicking.

Donnie jumped when he heard splinter.

"N-nothing..." Donnie said trying to sound convincing but failed.

"What's the matter with leo Don?" Raph asked as he and Mikey walked inside the lab "and no excuses this time!" Raph yelled loudly and slammed his hand on the table beside Donnie.

Donnie thought for a while. Should he tell his brothers what exactly is going on with leo? What is they start to panick? What is he breaks their heart when he tells them what he exactly saw on the computer? But don't they have the right to know?

Donnie sighed and looked towards his brothers.

"Alright, but let me do something real quick.

He hooked leo up to some machines and a IV bag.

He then lead his brothers and father out of the lab and shut the door behind him.

"So?" Raph asked Don with his arms crossed.

"Leo is...

Dying."

To be continued...