Hermione slapped her arm across her face, biting into her forearm to muffle the shout of pleasure that erupted from her when he pressed his thumb inside her at the same moment he latched his lips around her clit, and sucked. She was bucking, helpless against the onslaught of pleasure, as he set a rhythm with his thumb, his mouth. A bolt of pleasure surged down her spine when he began tapping his tongue against her clit, jaw working and thumb picking up pace.