Obssessed with Step-Sister’s accidental buttcrack

Description: Your step-mom is not home, she went shopping and your sister shows up unexpectedly. the two of you are not very close, so while your step-sister is on the couch next to you, you barely speak to eachother. you cant stop staring at her buttcrack. she starts cleaning a bit, while she is busy washing the cupboards, you put a pen in her crack. she feels so embarassed that her crack was showing. before she leaves she ties her shoelaces, you take the opportunity to put your finger inside her crack. you are such a pervert!