Moving up she smiled at her big brother. "Mmmm that was so good Jon. I love your cock. It tastes so good."Jon smiled. His naked sister's body rubbing ...gainst his was driving him nuts.He moved his head down to her full young breasts. So big and juicy. Sucking them slowly his sister moaned."Ooh god Jon that feels so good. Suck my tits. Suck 'em good," she encouraged.Sucking on her tits like a new-born baby Jon's hands went once more to his sister's crotch. It was drenched in her cum. Mary felt. Her tiny pink butthole faced up at me, and her pussy lips opened up... both were dripping wet. I guided the head of my cock to her opening. She pushed back, but she felt like a virgin... so tight, but things will fit with a little patience. The head slipped in pretty easily, but getting further required a bit of work. I pulled her hips back and forth, my cock sliding in a little bit further each time. I reached down around her belly and started rubbing her clitoris. “That feels good... fuck...”. I slowly inserted my dick into his tight ass. It was very hard to get through, he moaned in pain at first. Then I managed to slip into him. I waited a minute, all six inches of me in his ass. This was the best experience of my entire life. I slowly started to pull out, up to the start of my head, then going back in again. Ever so slightly I continued. His moans of pain soon became moans of pleasure. I was going faster now. Faster and faster. I was going to explode. He yelled one last time and I. I let out a small moan as the cum rushed inside of me. He didn’t pull his cock out and slam it back in like most men I have been with. He would just grind his cock into me as his cum gushed out of that long, hard shaft. Being rammed by such a big cock while having to be quiet, being in such a confined space, and knowing at any second someone could enter the stairwell was so intense. I didn’t even care that I didn’t cum. I wasn’t even worried about cumming. I just wanted to have him inside of me.