Reaching down between my legs, I slid my hand along the length of his cock until I reached his balls. Mark groaned as I started massaging them as he fucked me. My brother's arm slid under me and, as he had before, he hugged me close to him. I gasped in pleasure as he started fucking me harder while drawing me completely into his embrace. I switched from rubbing his balls to lightly running my nails across them and smiled at the moan Mark released directly into my ear. That moan was followed by a loud gasp as I contracted my pussy even tighter around his throbbing cock. Mark began...