I cum with her on my lap

Despite my missgivings I can't help but blow my load over her back soiling the back of her pink sports bra with my thick milky cum. My heart hammering in my head as my mind clears almost caused me to miss Amber giving a shudder and moan, before she placed the forgotten bowl of cereal back on the table and turns around sneering at me.

"O-M-G did you just fucking cum on me!" Her hands on her barely noticable- No her leggings seem to be straining against her hips now that while still small now actually exists and I can almost swear her ab muscles are ever so slightly more defined.

"WHAT!" I hear a breathy voice screech from the doorway as my eyes grow large and Amber blinks in confusion. Instantly I pull my sweatpants back up as Christa rushes in her fake tits and ass barely constrained by the pink negligee, her blonde hair still a complete mess from waking up and while her daughter is always pale she has a healthy sun tan. She gently turns Amber around seeing my handiwork as a mortified look crosses Amber's face as her mother's grow more red.

"What did you do!?" She glares turning to me and I can't help but get hard at seeing her surgically obtained hourglass figure beneath the pink negligee.

"Christa sh-"

"What the hell is wrong with you!" Christa screams her hand vanishing between her G-cups to pull out her bedazzled phone, "I should have called the fucking cops when Amber caught you peaking on her after her 18th!"

"I never-" I try to restate I never did that was an entire lie, but I'm silences as she places a foot on my crotch.

"W-wait, mom, there's no need for t-" Amber says her grin vanishing as she glances between Christa and me.

"NO! I've had enough, if this pervert knocks you up then how will you ever move up from here!" She screams as my heart sinks at the buzzing of her phone.

"Mom-he-he wouldn't, come on-"

"Thank you for contacting-"

"Yes my daughter was just ra-" Christa screams into the phone taking a moment to register the remaining "-the emergency services, but all lines are busy now, please try later."

For what seems like a minute Christa just gawks at the busy signal emitting from her phone before trying again but the second the same recording plays she lets out a scream before tossing it through the entryway and into the the hall beyond.

"Fucking useless pigs." She growls as pressing forward and down on my crotch and forcing out a groan from me.

"Mom, I-I think you should, um, just send him to his room, I mean he didn't actually try anythin-" I blink at my stepsister seeming to defend me for the first time in her life.

"Don't fucking lie! I saw him grabbing your hips as he thrusted like a dog in.....fine...I'll be the parent here!" As she _unfortunately_ removes her foot from my crotch, but it's quickly replaced with her hand down my pants as she cups my balls and shaft and forces me up and upstairs to her room.

The heavy door of the master bedroom slams behind me as she screeches "Kneel" pointing next her bed and all it takes is a single rough grip on my crotch to get me away from the door and kneeling beside the kingsized bed as she vanishes into the walk in closet containing almost entirely her clothes.