Eh, prolly about 6 months or so into the relationship. Started off with my luffa next to his and my shower gel aside his. :) Then with a few pairs of extra undies in his drawer for sleepovers. Then it was like I looked up one day and Gawd damn, my favorite book, favorite tea, most snuggly hoodie, some nail polish, and a cute little basket of lady-products were just chillen in his room. Yup!