I was in the living room with someone- I think my mother.  It was dark.  I got up and went into my bedroom, where my boyfriend Jeremy was.  My bed was in the middle of the room.  He was sitting on the bed, masturbating.  I saw several small spots of dried semen on the sheet as I lay down, facing the doorway, leaning on my elbow.  I was 'covering' him, providing some privacy while he masturbated behind me, as the door was open.  My dad walked by.