Barging into the bathroom, I found my Russian stepsister, a busty 18-year-old, feverishly rubbing her clit. Her eyes widened as I caught her, but I wasn't leaving. Instead, I offered her my throbbing cock, already hard from her moans. She hesitated, then eagerly took me in her mouth, her tongue swirling around my tip. I fucked her face, feeling her tight throat, until she begged for my cum. I obliged, filling her mouth with my hot load.