A curious student, dressed provocatively, enters her biology class early, finding her teacher already at the whiteboard. As he turns, his eyes widen at her revealing attire. She approaches, asking for help with her 'biology'. The teacher, visibly aroused, agrees, leading her to a lab table. He guides her hand over a specimen, his voice gruff, explaining the 'hard' facts. She playfully touches his crotch, feeling his erection. He hesitates, then gives in, kissing her passionately. He unzips his pants, revealing his hard cock. She eagerly takes it in her mouth, sucking and licking. He turns her around, bending her over the table, and enters her from behind, pounding her while she moans.