Secretly feeding my step-SON food laced with his BULLY'S CUM

Description: I fucking hate my step-son, with a passion. he is so stupid, that any sort of gesture i make immediately makes him think i love him. he is quite literally the most worthless sack of trash. he's skinny, dorky, beta, and not even smart. with that said, he gets picked on a lot. he had described his main bully a number of times, and honestly, the thought of him doing all of those terrible things on a daily basis just made me extremely turned on. so i tracked him down, and made him an offer he couldn't refuse. i would let him take me as his free-use sex slave if he agreed to keep the bullying up, and help me with a master plan. i tried to think of the most underhanded cruel thing i could possible do, and i landed on starting to feed my step-son his bully's cum secretly, and make him love it. it was easier than i thought, first i just jerked him off and mixed his cum into a sauce. the next time we fucked and i collected his cum for another meal, and then we got real wild with it. next i sucked his dick and let him face fuck me until he cums in my mouth and then i spit it out into the secret sauce i've been making. as things progressed he cums in my ass, and had me squeeze it out to then be mixed into his food. after that he creampied me with a massive load, ate it out of me, and then spit it into a sauce. it was absolutely hilarious how much my idiot step-son loved these special sauces i was using. they were literally just a random sauce with take-out meals, with the addition of his bully's cum. at one point he said that food just doesn't taste the same without mommy's special sauce, so i made him enough to have with every meal of the day. his bully continued to ramp up the bullying, hinting that he knows more about him and his mommy, and eventually our agreement was made permanent. i remain the bully's sex slave, as long as he continues to torment my step-son and help me with any plans i have to do the same.