Don't rush the relationship. The "sharing a bed" trope works best when the characters are still trying to figure out if they even like each other.
As the day went on, Sugary Kitty and her stepsister decided to tackle their first task together: setting up their shared bedroom. They spent hours picking out cute decorations, arranging their furniture, and making sure their bed was the coziest spot in the room. sugary kitty day 1 stepsister sharing bed with