Sex between siblings story

My parents left my 21 years old sister and me, her 24 years old  brother, alone to babysit the cat and the dog while they had a second honeymoon in Las Vegas. A vacation they long waited to have, they were excited about going and we were excited about them going and leaving us to stay home alone. I watched them bid goodbye to each other and noticed my  father rubbing his fully clothed cock against her, I watched my father hug my sister goodbye.

With her back turned to my mother, my father was unaware that I could see what he was doing when he reached his hands down my sister's back to squeeze and cup her shapely ass in his horny hands. With my sister not stopping him, he lifted the back of her short skirt to fondle her ass through her pink, bikini panties. I watched him kiss Rosalie  goodbye on her lips. Had she not turned her head away, he would have parted her lips with his tongue and French kissed her.

'Bad enough my sister is such a whore,' I thought. 

Siblings growing closer

With her having flashed her big breasts to everyone, I wondered if she had flashed my father her tits. I wondered if she had already blown him. I wondered if my sister already had sex with our father and fucked him. Two of a kind, with her just as horny as he is, it wouldn't surprise me if she already had incestuous sex with him.

With apartments being too expensive, not feeling good about still living at home with our parents, nonetheless, it was cheaper to live at home and pay our parents room and board than to rent separate apartments. It made more sense. Instead of paying rent money to a landlord, we'd pay our parents. That's how they were able to afford a second, Honeymoon trip to Vegas.

When our parents left for Vegas, it was finally good to have the house to ourselves. My sister wanted to throw a big, drunken party with all of her friends, but with me being more responsible, I put the kibosh to that. I didn't want a bunch of strangers destroying our parents' home. Besides, never having the peace and quiet of having the house to myself, I needed time alone.

Not wasting any time, my sister gave me a devious smile. I knew that I was in for trouble. Only, with me alone with my sister, and with my sister so aggressively sexual, finally submitting to her sexual lust, I knew that I'd be unable to resist her.

"With Mommy and Daddy gone," she said while pausing again to stare down at the growing bulge in my pyjama bottoms before looking up at me with sexual lust in her green eyes. "Wanna have sex," she asked with a little, dirty laugh?

She then lifted the hem of her nightgown to expose her red, trimmed, pussy to me.

Giving me a real show, with the hem of her nightgown pulled all the way up to her waist, she left her naked pussy exposed while waiting for me to make my sexual move. Showing me what she wanted me to see and what she expected me to do, I watched as she parted her pussy lips with her fingers to rub her already wet clit and finger fuck her naked pussy with her stiff finger. The first time watching my sister masturbate herself, watching her play with her pussy was as incestuous exciting as it was prohibited and forbidden.

Making me horny with her outrageous, sexual antics, I couldn't stop staring at all that Rosalie  was showing me of her naked body. Now that I was watching her play with herself, it was easy for me to make that leap, I imagined masturbating my sister. I imagined her masturbating me. I imagined eating and fucking her pussy. I imagined my sister blowing and fucking me.

"I dare you to lick my pussy while masturbating my pussy," she said while fondling her nightgown clad breasts and fingering her erect nipples.

When I ignored her and didn't respond, she dared me to sexually do something else.

"I dare you to fuck me," she said sliding a slow hand down her pussy to rub it. "Fuck your sister, Brian. I need to cum. Com'on, I'm horny. Fuck me, Brian. Please fuck me," she said while continuing to masturbate herself. "I double dare you to fuck me."

Spreading her legs and parting her pussy lips with her fingers, Rosalie  flashed me a lot of glistening pink. She moved her hand up and down as if she was stroking my prick. Then, she moved her head back and forth as if she was sucking my prick. When I didn't take her bait, when I didn't respond, she upped the ante.

"If you fuck me," she said in her sexiest voice while pausing to stare down at the growing bulge in my pajama bottoms. "I'll blow you. I'll suck your cock," she said while smiling and nodding her head. "I'll even allow you to cum in my mouth," she said. "Wouldn't you like to cum in my mouth, your sister's mouth, Brian? Wouldn't you like to fill my mouth with cum while humping my mouth, fucking my face, and fondling my naked breasts?"

Suddenly, I couldn't help but imagine my sister with my erect prick in her mouth, shamefully, my little sister was such a whore and an experienced cocksucker.

An offer too good to be true, how could I possibly say no to my sister offering me to blow me? How could I say no to her offering to allow me to cum in her mouth? Indeed, I'd love for my sister to blow me. I'd love to cum in my sister's mouth and all over her pretty face. Yet, not wanting to play her silly games, I wanted her to blow me and allow me to cum in her mouth but on my terms and not on her terms.

"Are you crazy?" I asked her while staring at her as if she had lost her mind. "No, I don't want to have sex with you," I said, making a disgusted face at her.

My mouth said no but my eyes said yes.

"And I certainly don't want a blowjob from you," I said.

I stated as if the thought of her blowing me and me cumming in her mouth disgusted me and made me sick to my stomach instead of sexually excited me to my core.

While watching Rosalie  masturbate herself, I stared at her continuing to expose her naked pussy to me. Decorated with trimmed, red pubic hair, my sister had a beautiful pussy. I'd love to explore her naked pussy with my fingers, my tongue, and my cock.

Only, how could I possibly justify having sex with my younger sister. Forever filled with guilt.

Nonetheless, I still imagined making out with her and slowly stripping her naked and while touching and feeling her everywhere that a brother should never touch and feel his sister's naked body. I imagined removing her bra to finally see her huge, naked breasts. I imagined touching, feeling, and fondling her big, naked tits while fingering her erect nipples.

Taking all of the self-control that I had, I still wanted her to blow me. I still wanted to cum in her mouth and all over her face. I still wanted to fuck her. I wanted to fuck my sister.

From that time forward, I masturbated every night and every morning while imagining feeling my sister through her clothes and making out with her. I imagined stripping her naked. I imagined having wild sex with my sister. I imagined eating her pussy and her sucking my cock. I imagined fucking her long and hard enough to give her multiple sexual orgasms with my cock.

Tempted to say yes and have sex with her, I imagined my cock buried in my sister's mouth. I imagined her stroking me while sucking me and while I fondled her big, naked breasts and fingered her erect nipples. I imagined cumming in her mouth and all over her face. I imagined giving my sister a cum bath.

To be honest, until that glorious, fateful day when we had sex, I never cared much for my sister. She was an entitled bitch and an immature, spoiled brat. Yet, my opinion of her immediately changed for the better when she developed a stripper's body, seemingly, overnight at 18-years-old. My opinion of my sister changed when, three-years later, we were having regular sex and fucking one another. She knew how to use her body. She was a great kisser and a good fuck, the best fuck that I ever had and I would fuck her as I like without her complaining about anything.