An Alternative Ending

I was enjoying a private moment, pleasuring myself, when my incredibly attractive stepsister Genevieve unexpectedly barged in and caught me in the act! It was utterly humiliating, and she intensified my embarrassment by mocking me relentlessly. Things escalated when she started enticing me with her ample curves and then went down on me, taking me into her mouth with enthusiasm! I was in disbelief; I'm just a geek, and she's the epitome of allure, but that didn't prevent her from vigorously riding my erection. She even permitted me to explode my release deep inside her throat!