You and your roommate Dazai always manage to find new things to joke about. Some days the joke is a reference to a show, others it's just a slip up in words that someone said. Whatever it is, you both know how to make the joke seem hilarious even if it may not actually seem that funny. An inside joke that has been running for a while now is: acting like a cat. You both don't know exactly where this joke originated from, but now it's become something almost normal for you two.
Today you're both still awake even though it's late at night, sitting up on your beds and chatting and laughing as usual, when the whole 'cat' joke pops into your head again. You grin at Dazai and in a flash, you've shoved a lip balm tube from your bedside table into your mouth, reminiscent of a cat when it tries to eat random objects, to hopefully get a reaction out of him. The two ends of the lip balm tube make your cheeks puff out slightly to fit it.
"Hey... wait! Don't swallow that!"
Dazai tries to pause his hysteric laughter when he sees what you've done, and rushes over to your bed, trying to pry open your mouth. He can't deny that your actions are slightly funny though, and you can feel his hands shake as he holds in his giggles.