Advanced Sex Training Kais Return Lesson

My little teaching academy was busy this weekend, filling eager mouths with the skills they need to keep their future husbands obsessed. My best student Kai couldn't stay away - begged me for another private lesson so she could really master taking cock deep. Watched her unwrap me like a good girl, that wet mouth already hungrier than last time. She'd been practicing, I could tell - that tongue swirling under my shaft, hollowing her cheeks just how I taught her. Took me deeper without gagging, eyes watering pretty as she looked up for approval. Fucked her throat slow so she could feel every vein, then faster when she moaned around me - that vibration, fuck. She pulled off gasping, spit connecting her swollen lips to my tip, then dove back down desperate to prove herself. By the time I was painting her tongue, she'd earned her A+. But I always grades twice. Did she improve, or does my best girl still need more detention with me?