I'm a college student and I live with my brother and his wife. I'm renting a room in their house. My room is next door to their room. My brother's wife is pregnant with the first child. My brother has gone out of town on a business trip. My brother and his wife have a security system in their house (with the security monitor, you can see the front door, the back door, the rooms, the kitchen, etc.). Last night I heard strange noises coming from my brother's room. It sounded like his wife was crying. I was curious and concerned, so I used the security monitor to look into my brother's room to see if she was crying. It turned out that she wasn't crying. She was masturbating and moaning. I should've turned off the security monitor, but I was turned on, so I continued to watch her. Watching a pregnant woman masturbate is new to me. She was naked on the bed with her legs spread wide apart. Her pregnant belly was huge. She was holding open her c**t lips with one hand and stroking her slit with the other hand. Her moaning sounded like crying (she was obviously very horny). She made sounds like "ohhhh, ohhhhh." She also rubbed her clit, curled her toes, and made sounds like "oooooohhhh, "ooooooohhh." She fingered her c**t hole too. She seemed to enjoy rubbing and pulling her clit. She rubbed her clit to orgasm. When she was about to cum, she crunched her face, squealed, and started shaking. When she squirted her cum, she screamed. It was nice to see her c**t milk squirting out. She kept rubbing her clit while she squirted. After masturbating, she put her hands on her pregnant belly and rubbed it.