Susan and I told our parents of our plans to get married. Needless to say they didn't quite like the idea and things didn't go well between us and our parents after that. So we got married, packed up our things and moved away. We had a cousin, Mandy, that lived in Colorado and she let us move in until we could find a place of our own. We decided to keep the fact that we are married from Mandy, at least until we found a place of our own.
Mandy didn't really question us about sharing her spare bedroom together. I guess it was because of the fact we are brother and sister. It worked out good because it makes it easier for Susan and me to have sex with each other. I didn't think things would turn out the way they did though.
Since it is Susan's day off, we decide to have a little fun around the house. So we wait until we hear the door close for Mandy to head to work and we rush out into the living room. Susan is eager to get into my pants and she pushes me onto the sofa as we enter. My cock is already hard and waiting, but I don't have to wait long.
She is on her knees, grasping my cock with her tongue circling my cockhead, before sliding her lips gently over it. She sucks softly on me as she slowly lowers her mouth down my shaft. I let out a soft moan as she takes my cock in her mouth. She slides her lips back up and then licks my cockhead again. Then she starts sucking my cock in earnest.
Susan slides her lips along my shaft, sucking firmly. She takes her time and I know she is enjoying the sounds of pleasure that I'm making. After a short while she begins to move slower, sucking harder on me as she does. Then she takes as much as she can in her mouth, before moving back to sucking firmly on me.
As she sucks on me, she begins to rub at herself. Her fingers seemingly move on their own. I can tell her fingers begin to increase her pleasure and in doing so it increases mine. There is nothing hotter than watching my sister finger fuck herself. She moves faster on my cock, using her tongue to lick along my shaft and then around my cockhead, before once again, pushing to take as much of me in her mouth as she can.
She slides her mouth up and down to hit the back of her throat and gag. She moves harder and faster, bringing me closer and closer to an orgasm. Her fingers continue rubbing hard at her pussy, building her own pleasure at the same time.
"I'm cumming!" I yell as I throw my head back.
Then I feel my cock throb and a second later, explode in her mouth. She gasps and swallows hard, taking my cum down her throat. I grunt softly, grabbing her head and holding it there until I am finished. We hear a sharp gasp from the living room entrance and as I look I am surprised to see Mandy standing there. "Uh," is the only thing I can find to say.
"Mandy, why don't you join us," Susan offers.
I look down to Susan, even more stunned than before. "What?"
My sister looks at me and says with a wave of her hand, "Mandy and I have been having sex since we were kids, every time we came to visit."
I look to Mandy for confirmation and she nods. "I just had no idea you were doing your brother," she says.
Susan smiles, "That only started recently, there's more."
"I can't imagine," Mandy says.
Susan laughs as I just remain shocked by the events unfolding in front of me. "We're married."
Mandy brings a hand to her mouth. "Oh my," she breathes. "Now that is just hot."
"I know," Susan agrees. "Want to join in?"
"Hell yeah," Mandy says stripping off her clothes.