Family vacation at the beach

Hi,I'm Jason this story happen when i was nineteen live with my dad ,mom and younger sister Janine ,every year in summer we would go to our bungalow for a week and spend most of the time on the beach ,fishing or doing other activities .Since we got there mom was a bit strange she would pay more attention to me than dad once a while she will hug me kiss me on the lips or press her big boobs i was get hard ,our first evening mom ask who want to go for a walk looking at sunset she knew dad was tired and bit drunk so she ask Janine she told to go she is chatting with Sarah her best friend and my fuck buddy .I fuck her more than i fuck Janine even me and Janine been having sex for a while and only mom and Sarah know ,mom at first was mad when she caught Janine riding me my hard dick up her ass but at the end she gave up just told us to keep it very discreet .Mom look at me i get up follow her on the way back we found a nice spot next to some big rock mom took my hand we walk on the rock she get between few big rocks she remove her short and panty and goes her T-shirt naked she look at me she say"hurry up before someone come show me what you do to both girls i jump get rid of my short and shirt walk to her get on her knees she took my long fat dick all the way in her mouth fuck it was the best blow ,get up put her ass on a rock spread her legs i position myself penetrate her ,i pound her hard making her moan and cum again and again she say"all the guy i've been fucking so far you are the only one that make me feel different you will have to fuck me everyday i will talk with Janine ok " i shoot deep in her i thought we were done she get on her knees again suck me hard same position she say to penetrate her ass i use spit fuck my cock slide in easily she was so loose there i ask she reply "you know who stretch me it's your dad worker Roberto he is so huge i told him never in pussy just ass ,she don't want to ruin her pussy by getting it stretch ".After i cum in her ass we make our way home ,once we got by the door we hear moaning we went by the window shocked seeing dad pound Janine hard while a stranger fuck her ass ,i was so pissed mom stop me remove my cock suck it turn around bend over i fuck her watching them after we cum we went for a walk came back 1 hour later they were both sitting doing what they were doing when we left .At night while fucking Janine she was loose i ask her she pretend not to understand i let it go ,since that day i fuck both .Now I'm 24 i married Sarah mom and sis come everyday for threesome or 4some if both mom and sis show up same time , dad never knew about me and mom and i told Sarah its time to stop fucking other guys and special her long time lover her Boss well since she work with him i don't mind me too i'm having my fun with lots of ladies and young girls, mom and sis well i guess life is ok like that