Recently, ever since my little sister got a boyfriend, she's been using me (her older brother) as a practice partner for blowjobs, desperate for her boyfriend's praise. Claiming that blowjobs are acceptable even between siblings, she seriously began her training. I could only stand in shock at her dedication. Her desire to be complimented drove her to become increasingly proactive. "Hey big brother! One more time!!!" she'd say, continuing to suck me without pause, sperm still dripping from her mouth, urging me to cum again and again. Her relentless enthusiasm made my cock increasingly aroused, driving me to mindless pleasure. In the end, it became clear she was dead serious about her blowjob training. Our sibling relationship deepened in the form of these intense blowjob practice sessions.