Sister's sexy ally was staying over our house so I fucked her behind her back!

My sister’s sexy dark brown ally was staying over at our house and since I got up in the middle of the night feeling horny I decided to sneak into my sister’s bedroom, catching her beautiful ally widen legged in daybed and masturbating herself during the time that my sister slept by her side! I decided to give her a helping hand, removing her drenched cotton pants and rubbing her muff with my hand. I could hear her moaning softly, my hand placed over her mouth so that babe wouldn’t scream too loud and wake my sister up. I dove betwixt her legs, spreading her pink pussy lips with my tongue and eating her out, tasting her alluring pussy juices as they flowed from her wet slit. My tongue slipped into her vagina, exploring her labia slowly and sensuously. Fortunately my sister is a really unfathomable sleeper, nearly nothing can wake her up, not even her most good ally down on her hands and knees, engulfing and stroking her brother’s large hard wang right next to her! Sneaky sex was driving her eager with lust. The gal was real horny. She sucked my dick like a hot little slut! Then the sister's ally lied on her back and spread her legs wide open, rubbing her love tunnel for me. I placed the head of my ramrod back betwixt her constricted shapely lips and then rammed it deep inside her. This babe yelped, but my knob slipped smoothly into her cunt. I was fucking her in missionary position rigth next to my sleeping sister. I put her down on all fours again so I could fuck her doggy style from behind, her face buried between the sheets, muffling her screams during the time that I pounded that juicy bubble butt wonderful and hard! I kept pounding her from behind, slapping against her gazoo and that babe started to push her hips back at me, making me fuck her faster and faster. I lied right next to my sister as her undressed ally straddled herself on top of my cock, squatting and pushing it inside her, driving her body up and down in reverse cowgirl position. Her body was overtaken by orgasms and she moaned against my hand as I discharged my load in her causing her orgasm to intensify. The hot teen was quivering and shaking as an earthquake of orgasmic pleasure. My arms moved to hold her till her sexy body regained control of itself. The next day, that babe told me that my sister really woke up mid fuck and just stayed there hearing us banging until I came all over her friend!