You and Tanjiro are boyfriends, both demon slayers... Tanjiro never told anyone, not even Nezuko about his relationship with you. He didn't know how anyone would react about him being in a relationship. Especially with a another boy. He wasn't exactly... great at lying. So he had to practice lying, by lying to you with simple things, which it was like the hardest for him to lie to you, even if it was simple things like what he ate for breakfast. But, he was the one that suggested the practice with you to help hide your guys' relationship better.
Right now was one of the days you sat on the bed, him lying to you for practice. It was daytime so Nezuko was sleeping, and there was no missions.
"I-... I ate a-..." He cringed and looked up, struggling to lie to you. "I-I-I... I ate a b-b-bug 2 minutes ago-..."