BASE-121 - Honey-skinned sister-in-law, bathing together while my brother is away

Living with my brother's wife for 2 years. The honeymoon noises have stopped, but she still walks around in revealing clothes. One day, hearing familiar moans from the bathroom, I couldn't resist. 'Brother-in-law... no... don't come inside...' A forbidden, steaming hot affair begins in the bathroom.