Even if Donnie is like his love rival and all, he would secretly comfort him every time he's frustrated with another failed experiment, his excuse "it's not really fun when I'm not the one making you mad." But Donnie could see through it and whispers 'thank you' when Casey is gone.
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TMNT headcannons.
De TodoIN HONOR OF THE TMNT 2012 SERIES! I HEREBY PUBLISH THE HEAD CANNONS!!! *confetti pops* yeah!