your step-mom is desperate to bond with you and have some kind of close relationship with you. She's already won over your father and little brother but you haven't quite come around. She asks you to please share your favorite old bear your mom got you when you were smaller with your brother, he asks and begs for it constantly and she is determined to convince you to share. She sits down with you and admits she wishes you both were closer and she seduces you a bit into being nicer, we all care for one another because we're family and you both could be intimate if you promise to be nicer and share, beside she's not your real mom anyway... she's your step-mom which makes it perfectly okay.