Sean had, had the best present ever from Tracy for his 18th birthday.
"That watch was great the best present ever Tracy" Sean joked to his sister the day after his birthday party, Tracy smiled as she sat up on her bed and placed her arms around her naked brother's chest pressing her massive breasts once more into his back.
"Hhhmmmm glad you liked it but I thought you would like the other present better, I sure did" she said kissing Sean's neck and upper back as she brought her hands down his chest to his growing cock, scraping her nails along his soft skin.
"That was ok I suppose" he said smiling from the feel of his sisters skin touching his back and her fingers now wrapping around his cock giving it light strokes with her sensitive palm, her fingers gripping it loosely.
"OK, I'm still feeling you're cum up my ass now and it was hours since we did it I think it was excellent Sean and...." Tracy stopped and smiled as she kissed then licked her tongue up her brothers neck and to his ear, licking the inside of it causing Sean to pull his head away not liking the feel "I think you did too" she finished in a whisper right into her brothers ear, the light wind coming from her mouth tickling the sensitive inner workings causing Sean to shudder.
Tracy moaned as she felt Sean's back rub over her erect nipples that were pressing on his back making her pussy wetter.
"Oh Sean Wilson you do know how to make me hot" Tracy said as she wrapped her legs around her brothers stomach, pulling herself against his lower back pressing her wet opening to him leaving a little wet sticky spot on him.
"Oh I now sis you too" Sean said as he felt his sister move her hips up his back leaving a trail of wet on him before lowering herself again to wipe it away with her little patch of pubic hair.
"Tracy, Sean are you awake?" Stephanie shouted her two children from the kitchen.
"Yer mum I'm up but Sean is still asleep I think" Tracy shouted back slightly giggling as Sean started to tickle her feet that were wrapped tightly around him and getting tighter.
"Well tell him its time to get up I've got work in an hour" their mother shouted and closed the stairs door.
"Now that was a lie young lady," Sean scolded his sister mockingly "You know perfectly well that I'm right here naked with my sister who's also naked rubbing herself against my back," he continued.
"Oh no I've not been naughty have I?" Tracy asked her brother making her voice sound like a little school girls.
"Yes you have and I don't like it, not at all," Sean said like a stern headmaster speaking to a bad student.
"Oh but I do know something you do like though" Tracy said in the school girl voice again as she gripped his fully erect cock hard in her left hand and started taking it up and down the shaft.
Sean moaned after a few strokes from Tracy's expert hands, which were starting to grip tighter around his sensitive shaft.
"Hhhhmmmmm that's nice Tracy ooooooohhhhh that's perfect" Sean moaned as his sister brought him closer to orgasm with her tight griped hand.
"Hm don't want to make a mess," Tracy said as she reached to her brother's side and grabbed a pair of her light blue knickers.
Sean had his eyes closed as he felt his orgasm nearing so he didn't see his sister grab for the knickers. Letting go of Sean's cock Tracy used both hands to open up the knickers.
"Don't leave me this close," Sean begged his sister as he felt her move her hand off him.
"Oh poor baby brother I won't ever leave you," Tracy said softly as she lowered the open waist of the knickers over her brother's cock, pressing the head into the crotch right where her pussy would go.
Pulling her hands out of the knickers, she once more gripped the cock of her brother threw them, sliding her hand over the material, making the thin cotton rub over the sensitive head and shaft.
Sean moaned out loudly as he felt his cum race up his shaft, his balls tightened and his cock jumped as it spewed forth the thick white liquid, splattering the inside of his sisters knickers.
Tracy tried to look over her brothers shoulder to watch the show as the thick liquid made the light blue material turn deep blue, but her massive breasts stopped her getting close enough to his shoulder to look over, so she just closed her eyes and tried to imagine what it looked like.
Sean could see and feel everything he watched as his cum filled the knickers and started to dribble out of the leg holes.
When Tracy felt Sean was finished she released him from her grip both her legs and hands and moved back from him taking the knickers with him.
Sean moved forwards and got off the bed grabbing his clothes he started to get dressed.
Tracy looked at the cum soaked knickers as she held them up in front of her face, Sean looked back at her just in time to see her stand on the bed and start to pull the knickers up her legs.
"Hhhmmmm" she moaned as she pulled the cum covered material high onto her pussy, making sure it coated her lips and as much skin as possible before pulling them down a bit and moving them around to make them comfortable on her body.
Sean watched in amazement as his sister wiggled around in the blue cotton knickers that only just covered her ass and pussy, she smiled as she saw her brother watching intently.
"Perfect" she said satisfied that the knickers were in the right position on her tight body.
Sean watched her step off the bed and grab for a tight top, which she slid over her body not bothering with a bra. Tracy walked over to her brother swaying her hips making the cum swish around on her skin making little squelching noises every time she bent and the material pressed against her skin.
"Get dressed Sean mum's going to wonder where we are," she said as she grabbed a short skirt not the normal leggings she wore any other time.
Sean shook his head and quickly pulled on his clothes before leaving his sisters room and heading downstairs.
Stephanie was dressed ready for work as her daughter came walking into the kitchen.
"Hi mom" she said chirpily.
"Hi sweetie" Stephanie said as Tracy walked by her and sat at the table "Good time at the party?"
"Yer I really think Sean enjoyed it," Tracy said rubbing her cum covered crotch onto the chair, loving the feeling of her brothers cum squelching into her skin.