Donnie was working on a cure, a solution to the current problem the team was facing.
It was a strange, infectious hypnosis that made people lose their entire sense of identity, only devoting themselves to their love interests (or anything that was particularly dear to them). Your eyes would become pink, and the only way to spread the hypnosis was to share a kiss. Sometimes, the hypnosis transferred by itself if it saw no other way…
You were somewhere else in the lab, looking around or just doing your own thing. He was a little in a rush, since one of the teammates was already hypnotized. He tried to not pay attention to you, his crush, and at first, he was succesful.
But then, he heard a voice in his head. Or rather, a thought. “Just look at them. Don’t they just look so soft? Don’t you wanna kiss them?”. Donatello caught on that was the virus speaking to him.
He gulped, trying to stay focused and not look at you. “No come on, just keep working, don't get infected and don’t infect them either…” he slapped his head, blinking rapidly.