Why does the stepbrother take advantage of his sleeping stepsister and forcefully kiss her?

In the sanctity of their shared bedroom, the young man found himself succumbing to an irresistible urge. His stepsister lay sleeping on the bed, oblivious to his eager advances. He couldn't resist the allure of her slender body and perky little tits. Unable to contain himself, he leaned in and pressed his lips against hers, his hands exploring her petite frame. Despite her initial surprise, she soon reciprocated his fervor. She eagerly spread her legs, inviting his throbbing member to explore her untouched paradise. The sight of her riding him, her small tits bouncing with each thrust, was enough to drive him wild. Their passionate encounter left them both breathless, their bodies entwined in the aftermath of their fiery tryst. His stepbrother had discovered a whole new world of pleasure, thanks to his irresistible stepsister.