So my girlfriend, with my throbbing black cock in her mouth(generously moist) while slowing rubbing my shaft up and down, goes and sticks a finger in my ass!!! I was seated in the backseat of her car, outside her parents house. We had just had our weekly date night and she wanted me to drop her off at her parents house(as she had some errands to run with her folks the next day). As she gently stuck her finger into my virgin ass, I was perplexed - as it felt strange, weird, exciting and good at the same time. I have always said to her that I wanted to try anal sex , but never in my wildest dreams did i imagine that I would be on the receiving end of it. She gently thrusted my virgin anus, with her small petite middle finger - going deeper and deeper with every thrust. As I guspt and looked down, i we locked eyes - with her mouth buried balls deep on my throbbing cock - i felt her smile as she milked me with skill and talent of an experienced dominant mistress. i was in total shock as to how good it felt, how gently she was and how much i wanted her to keep going. After a few minutes of her deep throughting me, milking me and generously fingering me, she abruptly STOPPED!!! Without a word, got out the car, grabbed my hand and made her way to the house - with a hard on, pants around my ankles -i followed her, as she opened the door(me scared for dear life as to what kind of kinkiness' was i walking into - we walked into the house, her sister was sitting on the couch, legs spread and up to her face - to my surprise she was fingering her beautifully shaved holes with a small, pink, rabbit vibrator - with another hand buried deep in her ass. She never opened her eyes to look at who was walking into the house - she just kept grinding and moaning on the couch. To my surprise, this was planned all along - her sister had been single for awhile(having bad luck with finding a guy - they had planned to help her out). Me, shocked look on my face - hard cock dripping precum - i was assured to sit next her. Without any hesitation, my girlfriend kneeled between my legs, buried her face on my crotch - started to vigorously give me a blowjob , with one hand in her pants - the other was deep in her sister pussy. All i could hear was both of them moaning in sync - i was in total disbelief of what was happening. Her sister without batting an eyelid, jumped up and straddled me, shoving my dick deep into her pussy - my girlfriend was now fingering both our anuses - in total rhythm to her sister riding my dick - deeper and harder with every stride. They both took turns sucking, rimming, fingering til we all nutted and passed out on the couch in the early hours of the morning!!! By far the best sex i have ever had!!! I really cant wait to do it again.