Christina's fingers penetrating her was wonderful. It hurt, and it felt so good. She lapped furiously, running her tongue all the way from her sister's arse hole to her clit and back again, pausing at both locations, and at both the other openings in between, to wiggle her tongue and penetrate it in as far as possible. The tastes were so varied. Her sister was clean enough, but no one is perfect and the feeling of disgust that washed through her as her tongue pushed its way inside Chrissie's arse for the first time was almost enough to make her climax.<br/><br/>What did in the end was the amazing way those wonderful fingers roughly thrust in and out, the fingernails scratching at her insides.<br/><br/>"MMMNFFFPPPHHH! MMMGGGGGGG! GHHHHNNNNN!" She gasped, her cries muffled by ther sister's wonderfol round bottom. Her hips, thrust up into the air as they were, and held by her own arms, jerked hard back and forth, and her juices squirted out. Not exactly a vast torrent, but enough to wet her sister's hand.