Unexpected Detour with Mom - Sex Stories

Unexpected Detour with Mom

... but they make an effort to keep things down.

"Oh wow."

The remark is so faint that I can't tell who said it. But it was the unmistakable groan of sexual pleasure. There's light, rhythmic, thumping noises behind me. What are they doing? Jerking? Sucking? I wonder if Luke is fingering mom's glorious pussy to completion, returning the favor from earlier.

When the thumping noises get louder, it becomes clearer what they're doing. Fucking. They are fucking back there. It feels like a punch to the gut with how brazen they are, and honestly, I've never been hotter. Thinking about mom's pussy getting stretched is so ludicrous that it's almost unbelievable.

The faint bouncing noise, the rhythmic 'plop-plop' sound of wetness, the soft muffle of clothes; it's a symphony. And then there's the growing intensity of breathing. I'm sure that's my mother because we've worked out together before. I know what she sounds like when she's breathing harder. What is my brother's cock doing to her precious body? For the first time in my life, I'm curious how big Luke is, now that he's my competition for mom's affection.

I'm extremely horny like they are, so I slip my hand down and touch myself. The lights outside are getting brighter because we're approaching the city, but it's still dark enough to hide my indiscretion. The van is loud enough to hide the sound I'm making and it's a lascivious sound if you're able to listen carefully.

My eyes are closed and I'm touching myself, ...

... listening to the natural music of them fucking behind me. Mom's breathing gets louder and I hear my brother as well. They try to hide it, but we're sitting too close. I'm on fire. I know how disturbing this sounds, but it's addicting, the ultimate forbidden fruit. She opened my mind to a deplorable fetish and she's doing the same with my brother.

When I look at the city lights, I catch Aunt Elizabeth's gaze in the rearview mirror for a split second. Did she see where my hand is? Did she notice me masturbating? Or worse, did she see the fucking behind me? I have to think she's part of the secret. I'm an utter mess between the legs thinking of all the perverted possibilities.

I listen to the faint whispers in the backseat.

'Oh god.'

'So close.'

'Shhh...'

The wet noise in the backseat sounds like a suction, pumping, and plunging combination. The unmistakable 'plop-plop-plop' melody. I know mom is having an orgasm because I've made her super wet before and I recognize the effects. It's what her pussy sounds like when she's being penetrated deep; for me it was two fingers, with my brother it's a hard dick.

I cum listening to them, closing my eyes and melting into the seat. My fingers are alive while I listen to the symphony of incest back there. I breathe quietly and I keep my motions reasonable, because after all, I'm pretending like I don't notice anything.

When they shuffle around -- presumably to fix their clothes -- I pull my hand away and lick my fingers. ...