I just got back from work, opened the house with my keys as I always do and started going towards my room. I didn't see anyone so thought I was alone. Walking past mom's room I could hear some noises. As I got nearer I noticed the door wasn't fully closed and I peeped and saw mom in a net lingerie. Just a net lingerie. On her knees on the bed with her lip wrapped around Sam's dick. Who was butt naked. One hand feeling mom's almost naked breasts and other behind her head, as if enjoying the movement of her head on his dick. The all of a sudden he says you aren't wearing the whole thing. Mom laughs but continues to blow him. He turns around and picks up what looks like a tiny belt. But it's clear soon after that it's a collar when he starts putting it around mom's neck. Mom doesn't even flinch. He took a while putting it on her, and for some reason, in that moment, it was so hot, I actually took out my phone and clicked. When he was done mom turns her head towards the mirror then laughs and says "Where do you even get things like these?" He says "That's for me to know. It looks god on you though. And so does this.." Then he starts feeling up the lingerie on mom's breasts which lasts for a couple of seconds then he really grabs her breasts hard, almost pulls her back down by her breasts. His other hand goes behind her head and he says "Now suck it real good so I can get to using it to make you scream before your son gets home". They both chuckle. Mom, as if eager herself, didn't wait for him to finish as he pushed her head down with his hand behind her head, she kissed him a couple of times on the stomach within a second and then took him in her mouth. Their new position is such that I can be seen in the mirror so I quietly bolt to my room without making any noise. I enter my room, fire up my phone and start looking at the picture I had just clicked. It hasn't even been 15 minutes or so since I entered and the noises of the bed as my friend fucks my mom have already started while I'm sat here in my room.