Two uncles meet on an internet bulletin board for videos of young girls. They record the growth of their innocent nieces, posting images and videos on social media. After watching the posted videos, the two hit it off and promise to meet in person and watch the act live. The uncles exchange their nieces, who have now gone on to college and grown up a little, and the uncles' desires escalate. During the cherry blossom season, the nieces also experience new acts and awaken to sex.