Looking up at him I said, “I want you to fuck my mouth, baby, just like I’m going to let you fuck my pussy later like I know you want to.” He moan as I said that and as I jacked my fist fast up and down his cock. “I want you to pound my mouth, slide it all the way down my throat and I want you to cum. I want you to shoot every single drop onto my lips and tongue, I want you to empty your balls into your big sisters mouth. Remember you promised.”
With that I wrapped my lips tight over his cock my finger lightly rubbing his balls. Taking a deep breath he held my head in his hands as he started to rock his hips slide his cock over my tongue. I knew he was so close. Pushing onto his cock I slid all the way down to his shaft deep throating him, showing him I could take him all the way in. Pulling out and with the tip of his cock still in my mouth, I said “Do it, baby, how many times have you wanted to fuck your big sister’s mouth, now’s the time to make her your cum slut.” Hearing my dirty talk he lost control. Thrusting his hips he fucked my mouth hard, his cock ramming deep into my mouth with every stroke.
Hearing me gagging softly over the thickness of his cock he grunted, “Fuck, yes, take my cock, sis, I love fucking your mouth. Take my big cock all the way into your throat.”
Almost on the edge of cumming, he eyes rolled back, as he began short fast the rim of his cock head catching on my lips every time. I felt his balls tighten, and then holding my face still with his hands, he pulled his cock out. Looking him in the eye, I whispered, my voice begging, “That’s it baby, shoot your cum into my mouth. I wonder what I’ll look like with your cum dripping from my lips.” Holding my mouth wide open, I grabbed his cock, jacking it tight and fast. His hips jerking, he yelled “Fucking hell, I’m cummmminnngggg, oh God arghhhhhhhhhhhh! Swallow my cum, sis!!” His massive cum shot out onto my mouth, dripping onto my tongue. As I swallowed another shot hit me on the lips. Opening my mouth I wrapped my lips around the tip catching the last few shots, his cum warm and sweet, filling up my mouth and dripping out onto my lips. Licking his cock clean rubbing him up and down gently he fell back onto the bed pulling me with him. Pulling my face down I thought he was going to kiss me, but he licked the side of my mouth softly. “Mmm, my cum never tasted so good as when it’s licked off your skin.” Covering my cum tasting lips onto his, he held me close as our tongue softly played together. The last thing I remember before falling asleep is his hand on my breasts, softly caressing my nipple, and him whispering, “Thank you, sis. For the best blow job of my life. I love fucking your sexy, naughty mouth.”
Waking up, sometime during the night, I was still lying in his arms, his head lolled off to the side snoring softly. Smiling quietly to myself, I remembered the pleasure we had just shared. I didn’t take long though before the thoughts took on a darker note. The same old doubts coming back. Surely what we were doing was wrong. Had I broken unwritten rules for the sake of momentary lust attack? Remembering the moments of tenderness between us, how I had felt that it was more than sex, and more than platonic love. I loved him as a man. A lover. Had I been deluding myself? Looking over at him, his face relaxed in sleep, my heart pulled. What if I was hurting him, getting him caught up in my own confusions? Was he too young to know the difference between right and wrong? His moral code based on the short term satisfaction of sexual desires?