I do have a crush on you

When Comet finds out that he has to go back to Mewni, he tells Marci that he likes her and leaves quickly without giving her a chance to answer. Now Comet and his Dad have to save Mewni from Toffee, but Comet's dad isn't exactly all 'Let's go destroy Toffee!!!' Like he is. Will they be able to stop Toffee before he destroys all of Mewni? And will Marci and Comet ever see each other again?