Funny enough I never saw or heard any signs of my father masturbating. My mother on the other hand... She had a massager right by her bed, a "magic wand" if you will. She would always say she was going into her room to take a nap and I heard that thing a lot. When I was younger she would occasionally leave the door open and I saw her pants and underwear on the floor and she would have the massager under the blanket. She always just said she was massaging her legs because they were sore.
I caught both my brothers masturbating. One jerking off, the other doing his pillow. The best was my sister in-law doing it on the couch in her skirt. Mmmm
Walked in on my brother once. He didn’t notice me so I just turned around and walked out as quickly and quietly as possible.
We never heard our daughter getting herself off but we knew that she was because she was a squirter (like her mom) and her sheets were always suspiciously wet and/or had huge spots where something very wet had dried. We encouraged our kids to masturbate because it was normal, natural, healthy and safer than having sex with someone - but we knew they wouldn't listen to that part. Baby girl was quiet about it but the evidence doesn't lie about what she was doing.
I have a teenage son as well and he has a Fleshlight with lube in his bathroom cabinet (his step mother and I know about it and we are OK as long as he is discreet about using it). I hear him using it pretty often as his bathroom is across from the kitchen. I got up to make coffee on Sunday morning and I could hear him breathing heavy and a slurping noise. We had plans to go to the gym and workout so I thought I would give him a hard time and tell him "hurry up and finish in there!"
I've done this and just a tad bit more. Lots of good fun memories. That was a very longtime ago. Nothing since 9th grade
One afternoon I wanted to get something from my 12 year old daughter’s room. Her door was partially open so I walked in without knocking and was surprised to see her lying face down with a pillow under her pelvis. She was humping the pillow and rubbing her pussy young vigorously. I quietly left the room without her seeing me. Another time I went into my bedroom to find my wife naked on the bed fucking herself with a massage oil bottle. She smiled at me when I came in and continued rubbing her clit until she orgasmed while I watched. When she removed the bottle, her **** was gaping, inviting me to fuck. I was already hard and quickly undressed. We fucked passionately. She had several orgasms before I ejaculated into her and she begged me not to stop. She kept coming until I came a second time inside her and we collapsed together on the bed.
I have seen my sister masturbating because we did it mutually when young. I have also caught my niece doing it when I went to use the shared bathroom at night. I could hear her scooting herself back and forth on her bed and was curious so I took a peek. She was humping her pillow. I didn't interrupt.
Due to the open nature of my house when I was growing up, I very often saw both my parents masturbate as well as my aunt and uncle, me and my cousins would regularly masturbate together
Many years ago - I had come home earlier than expected and my Niece was baby sitting. (she was mid/late teens, I was in my 20's) The kids were in bed and she was on the couch, eyes closed and a hand down the front of her PJ's rubbing one out. The TV was going but she appeared to be lost in her own little erotic world... I froze in my tracks not sure at first if she was or wasn't, as I peered into the room, I saw a little pair of jiggling pink nipples, one she was tugging on, then she picked up pace and started to moan and do uncontrollable Abdominal crunches. I just thought, dang she is really going for it.- good for her. I quietly retraced my steps back out and then opened the kitchen door much louder and closed it louder and paused a minute or two fumbling with keys before entering the living room. When I did walk in, she was sitting on the edge of the couch pretending to watch TV - flushed red face and overheated, pretending all was normal. I played along not wanting to embarrass her or have her feel she was caught. I just chatted and went about removing jacket and shoes and hanging them up. I couldn't help but notice her rock hard little nipples poking through the PJ top. We chatted for a few minutes and she said good night went off to the spare room. It has never been mentioned in the 30+ year since.
I applaud you response to catching your niece. I find no harm in using that situation as fantasy material.
I masturbated a couple of times with my brother when we were teenagers. Heard mt daughter once. Was not turned on just curious.