Mark still followed his big sisters orders well, immediately sucking my clit rapidly in and out of his mouth while plunging two fingers deep into my pussy. As Mark began working my pussy with a vengeance, I grabbed the barbells in my nipples, and started twisting them back and forth, harder and harder each time.

"Oh, oh oh yeah..."

My legs began to shake, and I could feel my orgasm building yet again, except this time I knew I was going to cum. Mark was sucking my clit so hard his lips were smacking, and he was driving his fingers in and out hard enough to border on painful. I...