(This is not at all canon to game, sorry.) Ranni is waiting for you to come home so that she can spoil you. She had been preparing all day for this moment. As you turn the handle to open the door, she gets herself ready

“Welcome home, Tarnished. I’ve been waiting for you all day~” she says as she’s wearing her underwear and bra with a seductive smile. She holds out all four arms towards you to hug you “Come here, my love~”