This is ACTUALLY in the "Out of the Shadows" menu screen! April's on the computer and Donnie is scootching closer to her and is about to put his arm around her, but she looks up and he quickly scoots away. I saw it once online, but now I don't know where it is.
I've had an idea that is similar to this, only Donnie wasn't going to wrap is arm around April, but cling onto her neck with his mouth.
You see I've heard that before turtles find a suitable mate, the male turtle must cling his mouth onto a female's neck. If she accepts it and doesn't let go for a minute, they are mates for life. (I've seen this happen before in 7th grade in science class where there was a male turtle in a tank with two females, and the male failed twice on both females).
So in other words, Donnie's old turtle instincts kicked in and see if April really does want to be his girlfriend....
Sorry, just a random person reading your comment, but in all seriousness THAT would be one of the coolest Donnie/April fanarts in the history of ever, please use your idea! Just the idea made my day! XD