When i was 17 I noticed my 13yr old sister snooping in my bedroom. I made noise so she knew i was coming and she hid in my closet with the door ajar. I shouldn't have done it but i stripped and bent over so she could see my butthole and then i jerked off. I quickly wiped off, dressed nd left so she could escape but i felt really guilty for weeks after that. That must have been the day my brain was in my dick.