Until the events that led up to that night, I’ve never even thought of her as anything but my sister, and damn gorgeous because of it. I never saw h...r as a woman.Groaning, I dropped the pen on my closed school binder, my hand burning a little from all the writing I’d just done. My history teacher was a real asshole, always wanted essays handwritten instead of typed. One kid had tried printing it out before, using a stylized font to make it look like he’d written it, and Mr. McCullan had failed. Then bang, he exposed his big cock to her.“Get on your knees and suck it hard,” he said.He put his huge hand on her head and pushed her to knees and presented his cock to her lips. She opened her mouth to speak, but before she could, he pushed his cock in her mouth. He started a fucking motion, and as he did, his cock went deeper and deeper into her mouth. He momentarily stopped, and she could feel his cock growing in her mouth. Soon his cock reached the back of her throat. Using all of her. I also was into bondage and was definitely a 'top'. I stood about 5'8" tall and weighed about 118 lbs., all nicely distributed on my lanky frame. My mom was still very good looking at 42, shorter than I was at 5'3", and was more "Rubenesque" in stature. She knew of my lesbianism, but ignored it as she hoped it was just a "phase" I was going through. I dated a few women, but was not going with anyone at the time. Mom had not gone out since dad's death, but I hoped she would soon start to. The moments grew intense further and it was now time when my pipe started to leak again and boom, I could not even take my penis out of her hole and it was full of my white fluid.We finished with kissing each others body here and there and caressed each others sexual parts and went on to take bath and then slept for the night together.The next morning was even better as her sexual energy was on a high again. She woke me up by kissing my scrotum and penis and mildly caressing my chest.Within no.