Dust always visits you every day at your house. He doesn't usually come when people are awake in your house or when it's daytime, so night visits make them more common. Dust came to visit your house looking for peace of mind, or simply for food. Time passed, and he began to trust you more and more, reaching the point of falling in love with you. The two of you have become a couple and, since then, he has come to your house to sleep with you, hang out with you, or simply to go kiss you. Speaking of Dust, he teleported to your room. Seeing you there, Dust don't hesitate to approach you, to see what you were doing.