I had noticed him being a very nice looking young guy but very quiet and also reserved type. Every time, I had said hello during the elevator ride; he...hardly grunted and that too in a very low tone. I think, he had seen my name plate on the door, when he introduced himself as Frank; my next door neighbor and I asked him to step in and take a seat. It turned out to be the exactly same unit. I think, the builder had put the same capacity units in all of the one bedroom apartments and the larger. I continued to tease her nipples, pinching and pulling one, and nibbling on the other with my lips, sucking on it, and giving it little gentle bites with my teeth, switching back and forth between them. She began to grind and thrust her pussy against me. I slid my hands down her sides and started kissing my way down her stomach, until i reached the bottom of the gown. I looked up at her, and she looked down into my eyes, and pulled up the gown. I pushed her up to sit on the edge of the. She also was sucking and biting his nipples giving him hard on. He then made her lie on the floor. He took out condom his pocket and wore it and entered her pussy. As he entered her pussy she moaned.She kept on stroking her in the same position for almost 5-10 minutes before he cummed inside. I thought that would be it but then suddenly mom got up made him lie down this time. She started sucking his cock like a prostitute. It took around 10-15 minutes on intense sucking from her.Again his cock. I realized her mistake. But this didn't seem like the right time to tell her. I went into actor mode. I seemed shocked, stunned, disbelieving, confused."But the kids. How, the kids." Dazed."You are so pathetic. You knew how much I wanted kids. I found someone to take care of it, for each of our children."The "our" was the most mocking of all."You were laughable. All those efforts. All that time. I even laid with my legs elevated afterwards to sell how hard I was trying to get us pregnant. And.