This animation consists of frames from about 7 seconds of video from the 2008 Japanese anime Kamen no Maid Guy. The clip (from 8:26-8:33 in the version currently available on YouTube) is part of episode 2, titled “Expert Of Loving Huge Breasts” or “Hakase no Ai Shita Kyonyū” (博士の愛した巨乳). The storyline is “When Naeka discovers that the reason she’s failing math is because her enormous breasts are taking away nutrients from her brain, she, her brother, Fubuki and Kogarashi try to find different ways of making her chest flatter.”
Image provenance by Bacchus at Erosblog.