Adultery My Mom & the exchange student

[Penetration]

When I came to the right side, there was no one in the living room. I came to the door of my parents' room like a thief, but I heard my father's soft "snoring..." and banging sounds coming from the room. I went back to Sam I listened in front of the door for a while, but it was still quiet inside. Could it be that I heard it wrong? 
　　When I thought I was hallucinating. 
　　The sound of "Pop!" came to my ears like the familiar sounds I heard in the past. It came from the first floor. 
　　I suddenly got goosebumps all over my body, but after so many previous experiences, I knew that this sound must be artificially made. 
　　Without thinking much, I walked down from the stairs on the second floor with my bare feet on the red carpet. 
　　The exquisite room lamp on the wall of the staircase was not turned on, and only the dim light was turned on in the living room on the first floor. 
　　I went down to the first floor, but I didn't hear any more noise. Standing at the stairs of the first floor, I felt like I was getting nervous. 
　　Just when I once again made up my mind to go back to sleep. 
　　"Ah ugh..." a woman's muffled scream came from the innermost room on my right.
　　I suddenly had an idea and looked over there. The door to the innermost room was closed, but I seemed to see the dim light inside coming from under the door. 
　　I held my breath and walked over there gently. 
　　As I got closer to the innermost room, the gasping sound of "ah um... um..." seemed to become more and more obvious. 
　　When I came to the door of that room, I seemed to hear someone talking inside. 
　　"Are you in love with me?" Sam? 
　　Although the soundproofing of the room was very good, I could immediately tell that the sound coming from the room was Sam's. 
　　What is Sam doing in there so late... Could it be! ... 
　　Suddenly, I thought of an image that made me tremble in place with excitement. Mom and Sam were rubbing against me and dad while we were sleeping. Are they doing those things down here? 
　　"...You are thinking too much." A woman's cold voice, but isn't this...the voice of my mother! 
　　My whole body was shaking with excitement. Why was my mother like this with Sam again? Wasn't she afraid that my father and I would find out? 
　　"Then why don't you reject me?" Sam replied. 
　　"..." 
　　"I'll give it back to you, no matter what I owe you." Mom was silent for a moment and said coldly. 
　　"I want it myself, and I don't want you to pay me back." 
　　"I never owe anyone anything." Mom said still coldly. 
　　"Hey, aren't you afraid that daddy won't be able to find you when he wakes up?" Sam said teasingly. 
　　"I have promised you to come down. Whether you do it or not is up to you. If you don't do it, I will go back." Mom said coldly. 
　　"Hey, Mom, I like you like this." 
　　"Well..." After Sam finished speaking, I heard my mother groan in discomfort. 
　　Is Sam bullying his mother? what do I do! Thinking about it, I clenched my trembling fists excitedly.
　　"Ah um..." After a few seconds, my mother groaned uncomfortably again. 
　　At this moment, I really wanted to kick open the door in front of me, but there was a voice in my mind that kept telling me not to be impulsive.