My sister-in-law appears refined and elegant at first glance, but in reality, she hides a gorgeously voluptuous body that's irresistibly attractive. My older brother married her after meeting at a men's spa. As his younger brother, I've become a regular at the same establishment, secretly longing to have sex with her. The place operates like a typical men's massage parlor, and the occasional breast contact during treatment—could it be a subtle signal? I've also received pleasant rewards from other masseuse colleagues, even getting my cock sucked. Eventually, I directly asked my sister-in-law, and she allowed me to penetrate her pussy. The whole process was a mix of anticipation and nervousness.