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Donatello was always considered the smart one, the one who could build anything with just little time for his brothers and himself. His brothers already had there things that they where good at. For example, Raph had his strength, Mikey was amazing at art, and Leo was great at planning. But for some reason he felt like he wasn't as useful as he was previous the Krang war. He always felt so weak and never felt like standing up or being productive most days. It might have been the fact that he didn't eat as much or just didn't eat at all most days.
Although he never acknowledged that he was eating less and less, he could still acknowledge the fact that his mental health was not well. Sooner or later he started to grow fascinated with the thought of inflicting pain upon himself. It started with a few bites on his hands, then his arms, and later escalated to using a tiny but sharp razor blade to cut his wrist. Not just his wrist but anywhere he could hide with his oversized hoodie to make it seem like nothing was wrong. Afterall he was the smart one so he was sure he knew what he was doing.
Turns out he skipped a few steps because soon his brothers started getting suspicious that something was wrong. Raph was the first to notice how their opponents would seem to carry him up with such ease that even they were surprised, not that they were complaining thought. Raph then told Leo about how he was concerned about Donnie's health so Leo came up with a plan to see if something was actually wrong. His plan consisted of convincing Donnie to get help with any injuries after a battle or if he got hurt one day. Then he would try to figure out if Donnie was indeed eating enough or his body developing differently.
In one particularly bad fight Donnie messed up his legs bad, not that it bend or anything, but it had bruises and scratches from lading on it too hard. Raph took care of carrying him to the lair and finally Leo's plan was put to use.
"Hey Dontron! Your legs look horribly messed up so I was wondering if you would let me see it. Just to bandage it and make sure it's not infected." God he hoped Donnie would accept his request. Either way he would find a way to convince him. Afterall Leo wasn't one to back down.
"...Hm. I don't know I mean it seems like something I could bandage myself-"
"YES. Ok thanks. Raph take him to the Med Bay, thanks hermano!" Donnie was suddenly cut off by Leo and was now on his way to the Med Bay. It made him a little nervous with the worries of being caught with cuts but since he didn't inflict too much harm on his legs he wasn't too worried. He did notice how Raph's expression changed into something close to a guilty glance his way but it soon changed to a nonchalant expression. He tried not to think to much about it but somehow, someway, it worried him.
Once Raph, Leo, and Donnie arrived at the Med Bay Raph softly placed Dee on the hospital bed and left to accompany Mikey, now it was Just Leo and Donnie. To say the tension in the air was so thick you can cut it with a knife was a understatement. Not one of the two brothers talked for a good thirty seconds before Leo started to get the stuff needed to treat Dee's injuries plus anything else he found. As Donnie patiently waited for Leo to get supplies he prayed silently that Leo wouldn't find scars or cuts or nothing that could blow his cover.
Dread filled Dee as Leo slowly took a seat across from him as he laid all the materials down. Soon Leo started to talk while taking off Donnie's black bandages on his feet.
"So, Donnie, having any symptoms or any more pain anywhere else?" Leo asked hoping to get the answer he was looking for.
"No actually I'm okay just the leg I guess." It was so obvious in the way he talked that Dee wanted to get this over it to rest, maybe create something for his own entertainment. Luckily Leon asked no further so he had nothing to worry about. Or so he thought. Soon Leo tried to convince Donnie to take of his hoodie he always wore now adays.
Of course Donatello kept refusing and refusing trying to get Leonardo not to talk about it anymore. Leo, being the persistent guy he is, continued trying to convince Dee to take the hoodie off.
"Leo I'm serious I don't feel comfortable taking off my hoodie."
"Why do you even wear it? Ever since that Krang thing you've been wearing that stupid hoodie all the time! If you had nothing to hide you would have no problem taking off!"
'I"M NOT HIDING ANYTHING LEONARDO!!!!" All the stress was getting to Donnie and he felt himself tear up but tried not too.
"JUST TAKE IT OFF DAMMIT!!" Leo reached forward and attempted to pull the big, purple, oversized hoodie off him.
"NO LEON I WILL NOT TAKE IT OFF! LISTEN TO ME FOR ONCE IN YOU STUPID LIFE!" The action made Donnie start to tear up and soon he realized he couldn't breathe. Leo noticed he wasn't saying anything and asked what was wrong. Although he was mad he was still worried about Donnie so when he didn't respond he stood from his chair and walked towards Dee. Once he saw Dee not breathing he got worried and continued telling Donnie to take deep breaths.
"Dee just take a deep breath okay. Deep breath in, hold it, deep breath out. Good, continue doing that." After a few minutes Donatello calmed down enough to be able to breath normally. Leo went to get room temperature water so Dee could drink it if he did have a sore throat. On his way back to the Med Bay he saw Raph and Mikey hanging together and went to talk to him about the situation.
"Raph, Michael, we need to have a serious talk. It's about Donnie"