Here's the situation in hand—You met these turtles a few months back on a same situation you were assigned too about the kraang. That ended you up bumping into them in some fight and worked with them—which that time you and Leo clicked overtime.

He was the one who asked you out—his brothers specially Mikey and the other two mutant turtles that witnessed it. Was happy because after that Leo was distracted and also less strict when lecturing.

It was fun in all—dating Leo. Healing his heart by karai's rejection. Filling in that void in his stern heart. But it's now or never— you went inside the dojo alone to confront Splinter—that was meditating infront in his bonsai tree, to ask to be finally be official with Leo. They were all eavesdropping and Leo was certainly nervous while listening—but of course Casey and April wouldn't stop whispering asking about the whole thing.

Just convince Splinter to date Leo then everything will be good—but we all know Splinter. Good luck mate.