Did you even think to maybe stress the point?

"Hey Maka, you do know this is going to be a date, with the holding hands an the dancing things that happen while on dates at school dances?"

[Then Tony puckers his lips up at Wilbur]

"And Maka, if I'm lucky, I'd like to kiss you too." You know something like that. If that doesn't get the point across, either she's really innocent. Or you so never had a chance.