Adultery My Mom & the exchange student

[Penetration]

After waiting at the college gate for a while and taking a bus for nearly twenty minutes, I finally returned to the gate of my community. 
　　Fortunately, today is a working day and my mother goes to work at the bank. Otherwise, if I come home now to pick up the forgotten things, my mother will scold me. 
　　I ran to the door of my house, quickly took out my keys, opened the door and walked to my bedroom.
　　When I was about to push the door in, I found that I couldn't push it in. I frowned and pushed hard twice but still couldn't push it. I knew someone had locked the room. 
　　"Zihan?" Sam called me from the room. 
　　"Well, what are you doing? How do you lock the door?" What is this guy doing at home if he's not going to play? 
　　"Oh wait, I'll open the door for you." Then I heard footsteps approaching. 
　　"Zihan, what are you doing back here?" Sam opened the door from inside and looked at me strangely. 
　　"I'll come back to get the summary report I wrote last night. By the way, there will be a class meeting after the exam in the afternoon. You remember to go there around five in the afternoon." I turned away from Sam and walked into the room. 
　　Go straight to the desk. 
　　A piece of yellowish A4 paper folded in half was placed on my desk. It was the report I wrote last night. 
　　However, as I got closer and closer to the inside of the room, I felt an indescribable smell inside. It was a fragrance mixed with a thick smell of... semen or something similar? I sniffed, and the smell smelled a bit lusty. 
　　I looked back at Sam, was this guy masturbating? 
　　"Sam, you're not going to lie on my bed and masturbate, are you?" I saw that the sheets and quilts that I had tidied up this morning were now a little messy, and I felt like someone was lying on them, turning left and right, unable to sleep. The bed sheets are wrinkled. 
　　When I thought about this strong and strange smell, I suddenly became angry. 
　　"Ah... Zihan, I... I didn't masturbate... but I just came home to rest and was too tired to lie down on your bed, so I fell asleep directly. I'm sorry." Sam came over with a sad look on his face, waving his hands nervously Tell me. 
　　"..." 
　　"That...it doesn't matter, just don't do those disgusting things." I thought of my mother being bullied by him, and I said coldly. 
　　"Zihan, why would I masturbate on your bed? You are my brother and I love you very much." After saying that, the guy spread his hands and hugged me.
　　At that moment, a very familiar smell poured into my nasal cavity. It was so familiar that I almost thought of it and immediately lost my memory. 
　　"Okay, I get it. I'm almost late and I have to go back to college. Remember to go back to college for the class meeting." I pushed Sam away with uncomfortable hands, told him, and walked out. 
　　I know there's still a lot of time left in college before exam time, but I just don't want to have too much contact with Sam, at least not now.