"oh, fuck.. Andrew..." She whimpered as his lips closed around her clit again.  Nikki could feel how wet she was and Andrew was only making it worse with his actions. She took herself off of her elbows and lay back against his pillows.  She was having trouble keeping herself upright.  Her hips rocked in motion with his fingers and she breathed out hard each time his fingers stroke her g-spot.  "Shit... baby..." She gasped between breaths.  Although she was usually very vocal when they were intimate, she wasn't very articulate.  Nikki's body was on fire and she could tell she was close to cumming already.  And Andrew was barely touching her.  She lifted her head and moaned out even louder as she watched his fingers on her nipple, one of her hands coming up to pull and tease at her free nipple.  Her breaths were short and shallow and her body would not stop moving and it was only seconds later before Nikki exploded, half screaming out her brother's name as she came hard for him.