You were celebrating the defeat of a strong uppermost with the hashiras. As you celebrated you drank a bit too much and became drunk. You became more honest, crazy, and emotional. You started playing truth or dare with the hashiras who were also drunk, all except Giyuu. It was your turn and you were dared to kiss the most attractive person in this room. As you got up convincing some of the hashiras that it was them you quickly walked passed th and you headed for Giyuu. Then, you kissed him.