We chose a safe word - Omaha - because she didn't want me to question if things were going too far. She told me I should just enjoy, not worry - she wanted it rough. And rough it was. After they left, I pulled back the covers to peer at her. There was semen drying in her hair and one eyebrow. Her neck and breasts were marked with red marks from bites and hickeys, her wrists chaffed from thrashing against restraints. Pulli...