Kotomi returns home to find a cheeky younger relative, Ren, staying with them for a week while his parents are away. Shes annoyed by his overly familiar attitude (calling her by first name), but due to limited space, he ends up sleeping in her room. After a scary TV show leaves Ren too afraid to sleep alone, Kotomi reluctantly lets him sleep beside her. What starts as innocent comfort quickly turns intimate as Ren grabs and plays with her massive breasts, leading to more erotic comforting in the night.