Walking down the hallway, I notice a light on under the door. "He should be in bed," I scold him under my breath. I push open the door, finding him wide-eyed and restless. "Sweetie, you need rest before your big day tomorrow," I whispered, sinking onto his bed. My palm settled on the blanket to soothe him. But beneath, something hard pressed back. I recoiled. "S-Sorry, I’ll go", I say as I go to stand. "Please... just help me? I can’t go to bed like this," he says to me. My stomach dropped. This was wrong. So wrong. But those pleading eyes... "One time," I breathed, shame scorching my cheeks. "Never again." I peeled back the covers. I reveal his swollen cock, veins throbbing. My fingers wrapped around it, stroking slowly. "Faster," he begged as he bucked his hips. "Your tits... let me see them?" Reluctantly, I freed my heavy breasts, letting him worship them with groans. Then his plea turned darker: "Let me feel your pussy. It’ll calm me, I promise." The request hung in the air, filthy and tempting. His hands dragged me onto his lap, my slick pussy swallowing his cock in one thrust. "Don’t cum inside!" I gasped, riding him frantically, nails digging into his shoulders. He felt massive stretching me, every snap of his hips unraveling my resolve. When his breaths turned ragged, I ripped myself off him. I jerk his shaft until ropes of cum splattered my tits, hot and thick. While covered in my StepSon's cum, I am instantly filled with shame. But there is another feeling there. One that I can't and won't think of, one that involves a guilty pleasure that came from this. But I tuck that far, far away. While folding laundry, he approaches. "We shouldn’t have..." I stammered, avoiding his gaze. But his sweatpants tented aggressively. "Look what you do to me," he growled, freeing his hard cock right there in the living room. My pulse spiked. God, he’s already hard again... Against my judgment, I dropped to my knees. "Just a taste," I lied, taking him deep into my throat. He yanked me onto the couch, peeling my leggings down. "Need to be inside you," he demanded, spreading my pussy wide. He is intent on changing my mind to enjoy this, us. I cried out as he slammed in, his thrusts possessive, claiming. "Gonna fill you properly this time, how it should have been the first night," he snarled. No condom. No mercy. I felt his cum flood me, dripping down my thighs as he pulled out. The feel of his cum still haunting me, still inside of me. Even days later. Alone again without the rest of the family, he pulls me against him. This time, I didn’t fight. My blouse fell open, offering my nipples to his hungry mouth. He sucked hard, groaning as he groped my ass. "Turn around," he ordered. I bent over, presenting my dripping cunt. His fingers slid through my wetness, mixing his old cum with fresh arousal. "Still so tight," he praised, driving back into me, feeling his cum from last time still inside of me. Each stroke pushed his seed deeper. My back arched, craving it. "Cum inside me," I moaned, nails scraping the wall. "Fill me again." He obeyed, pumping his cum deep inside of me. Holding it all inside of my greedy pussy, I don't want any of his cum to escape. I smiled, finally admitting the truth. This was where I belonged.