Step-Mom Is Watching Us...

My stepsister and I have been playfully teasing and enticing each other for weeks now, keeping things verbal until my urges hit a breaking point. No actual intimacy yet, but a guy can only endure so much seduction before craving more! Why not push this further into something steamy? Right this second? Our parents are right downstairs! Then we'll have to keep it hushed and intense... Do you even have protection handy? Nah... But I swear I'll withdraw in time, I don't want to risk impregnating my stepsister and creating a total mess. That would be a nightmare... Alright, let's dive in! We start off slow and careful, desperate not to alert our folks. I hike up her top and tease her firm, erect nipples, feeling them harden under my fingers... Can I wrap my lips around them? She's craving my touch as much as I am, both of us burning with raw desire after all this buildup. At last, I slide into her slick, tight 18-year-old slit, her wet folds gripping my throbbing cock like a vice! We're lost in the rhythm, but just as I'm on the edge of exploding, step-mom walks in unannounced! I urged my stepsister not to pause her wild grinding on my shaft, and step-mom was initially shocked. Yet, she quickly seemed aroused, fondling her voluptuous, natural tits and sneaking her hand beneath her skirt to pleasure herself! Distracted by the sight of step-mom's explicit self-indulgence, I couldn't hold back and pumped my hot seed deep into my stepsister's ripe, welcoming pussy! Oh shit, you promised to pull out!! My bad, sis, let's get you dressed and head out for that emergency contraceptive... Step-mom bolted from the room before we realized she was spying on our forbidden encounter!