Step Trainer: Squeezing in a Fuck Break

This nasty piece of ass, my step-sister, has been drooling over me for weeks. She knows I'm trying to get ripped and she can't resist sneaking up on me when I'm pumping iron. Today's the day, she's decided to show off her titties in a tank top so tight it looks like they're gonna pop out at any second. My dick is throbbing just thinking about those bouncing beauties as she approaches me with a sly smile. She's got that seductive voice whispering sweet nothings in my ear, 'Hey bro, want some help with your weights?' Yeah right! I know what she wants and it ain't no spotter for my squats. Next thing I know, we're rolling around on the floor, her pants are down, and her mouth is wrapped around my cock. The whole room's filled with the sound of groaning and slapping flesh as we go at each other like a pair of wild animals.