[M4F] Sister-In-Law Moves In

M27 disapproves of his F22 Sister-In-Law moving in until she begins treating our home like her home. Slowly, she begins dressing with less and less clothes on as she lounges around the house. Then, begins leaving her door slightly ajar to temp him to go in. Wanting to build off this plot so please come with ideas! All characters are 18+

I write either 1-2 paragraph responses or short entries to continue the flow of the story. My schedule is pretty crazy so warning that I may not respond until a few hours.