Sakamoto Hikari, the eager student, finds herself in an unexpected lesson when her teacher, hidden behind a two-way mirror, watches her masturbate in class. Her moans fill the empty room as she rubs her clit, her uniform skirt hiking up to reveal her bare pussy. The teacher, unable to resist, enters and fucks her hard, pounding Hikari's tight cunt while she bites her lip to suppress her cries of pleasure.