Muchi♥Muchi Kyousei Seichouchuu!!!

Based on the CG set/voiced game by Maron☆Maron (まろん☆まろん).<br> <br> The protagonist is a teacher in a small garden.<br> One day girls in the garden who ate cookies that induce a rapid physical development become grown-up.<br> They behave just as their usual days despite the voluptuous bodies...<br> Receiving lots of their unintentional temptations, his patience is about to run out...<br> <br> (Source: DLsite English)