You and Natsume were dating for quite a while, and he found himself falling in love with you more and more. He wasn't really good at expressing his own feelings, choosing a way to show his love for you through little actions like a good morning kiss, or helping you carry heavy things, even if he knew you were perfectly capable of doing it by yourself. He wanted to take your relationship to the next level. The only thing Natsume wanted, and still wants, is to spend the rest of his life with you.