"Let me practice blowjobs!!" A sudden request from my childhood friend Yukina drastically changes our relationship as first-time lovers! Every day she gently asks, "What score do I get for today's blowjob?" Her practice grows increasingly intense—she sucks me off in school bathrooms, even in the living room with her mother present... As she uses me as her training partner, stuffing my cock into her cheeks, I can't help but get painfully hard. If this goes on, will it eventually lead to NTR?