Michelle falls to the bed and I follow. Laying on top of her,she’s rubbing her clit as my cock starts to soften. With one final orgasm,my cock slide... out of her pussy. “Oh god baby,that was great,I love it when you fuck me like that.” I kiss her back as I’m hovering above her,her body trembling from the orgasm. As I go to roll off Michelle,I catch a shadow move in the living room. I go to get up but Michelle grabs me and pulls me close. “Where you going baby,lay here with me.” I thought I saw. ...... but I digress.... She spanked my bottom for some five minutes over my briefs, pulling them into the crack between my buttocks but without pulling them down, with increasing severity and all I wanted to do was push my ass up towards her hand and spread my cheeks apart to give her a larger target ... and my backside, like hers is not a minute target!My cock was by this time in an extreme state of sexual excitement and slippery with my juice; my balls were bursting when without warning she. I then eased my dick, one inch at a time, into Natalie’s butt, making her bite her lower lip on tape as she felt my thick prick fill up her backdoor. I grabbed her hair as I took possession of what was now rightfully mine, my sister’s bottom, her rump, her backside, her tush. I owned her sweet ass ... it was mine and I was playing for keeps.“Oh, fuck, bro! It’s big! It’s deep!” Natalie groaned and grunted as she took my cock as far inside her tight booty as she could stand.“You love it, don’t. “Anything else?”, she asked.Of course she had to ask.“She kissed me”, he said, visibly wincing.“You’ve got to be fucking kidding me, MARK. I mean, c’mon!” She raised both arms in frustration.She glared at him. “What am I supposed to say? Good job?!”“I didn’t want this”, Mark pleaded.“And why do you think she came to OUR house? Why?” she pressed.Mark didn’t expect her to ask that question. “I, I don’t know”, he responded.“It’s because you led her on, and she knows you’re weak”The comment stung.