My stepsister's boyfriend never satisfies her, leading to her desire for me

My stepsisters boyfriend is a total disaster in the bedroom. He's incapable of satisfying her, leaving her feeling unloved and unsatisfied. Watching her struggle to find pleasure with him is heartbreaking. I've noticed her reaching out to me, seeking comfort in my touch. Her desire for me is palpable, and I'm more than willing to fulfill it. One day, while her boyfriend is out, she takes matters into her own hands, pleasuring herself in front of me. Seeing her naked and alone ignites a fierce desire within me. I take her from behind, exploring every inch of her. She welcomes my touch, her body responding to mine. As we move together, she eagerly takes me into her mouth, her skills evident. The sight of her on her knees, taking me deep, is a sight to behold. The climax is explosive, leaving her satisfied and me covered in her warm release.