This happened a few years ago while I was still living with my mom and dad. My girlfriend Fran was staying over, and the two of us were woken up in the middle of the night by strange noises coming from my parents room. Eventually we realized that it was nothing more than pure, hardcore, sweaty, dirty sex. The kind of stuff you would hear in porn.
The sound of their bed crashing into our shared wall; the loud grunting and moaning; dad's aggressive dirty talk and my mom begging for more, and deeper, and harder... Everything sounded crystal clear, as if it was happening right next to us.
Fran and I had totally opposite reacting to what we heard. While I was frozen and horrified, she was smiling and laughing. At one point she suggested we sneak out to take a look.
"Are you serious?!" I whispered. "Babe, I'm not going to watch my parents have sex."
"Come on, don't be such a prude," she said, already getting out of bed. "It's just a little look. Haven't you ever wondered how your mom looks naked?"
Before I could respond, she ran out the door without even bother to change. I quickly raced behind her and saw Fran already peeking through a crack in the master bedroom's door. Following my girlfriend's lead, I reluctantly looked inside.
"Honey, just look at that..." my girlfriend whispered to me as if in a trance. "He's so big... How come you never fuck me like that?"
I couldn't give her an answer. Truthfully, I was asking myself the same question.
It really was an amazing sight. Dad had mom bent over the bed, fucking her hard and fast without even a hint of fatigue. The two of them must have been so horny that they forgot we were staying in the room next to their, or simply didn't care.