[TSF no F (NOMU)] Welcome to the Succubus Sorority ~Turning into my younger sister's little sister~ [Full Color]

A young man's life gets flipped when his younger sister—a horned, tailed succubus—has him magically transformed into a girl to become her new little sister, reasoning she'd rather share pleasure with another girl than with a boy. What follows is a breathless crash course in girl-on-girl intimacy, from a shy shared bath that melts into a first kiss to sweat-slicked tribadism where their bodies and spirits grind together. Even as she insists she's still a boy deep down, her soft new curves and flushed skin surrender completely, and she nods through the afterglow promising to keep enjoying their sisterly arrangement from now on.