[Amagappa Shoujogun] A Firefly's Glow (COMIC LO 2007-12) [8moe]

In a quiet classroom setting, a studious girl with glasses finds her academic focus suddenly shifted when her teacher decides to initiate a hands-on lesson. What begins as a tense moment of anticipation quickly transforms into an intense, sensory experience as the strict boundaries of teacher and student dissolve. As the teacher claims his prize, the girl's initial hesitation turns into overwhelming sensation, leading to a climactic realization of her burgeoning desires during this unexpected private lesson.