Art series from the Japanese image site Pixiv, by the artist 空豆.
There were actually 12 images in the series, but due to Tumblr’s limit of 10 images, I had to cut 2 of them. This is unfortunate, but nothing could be done. Please visit the artist’s original page to see the remaining 2 images♥♥♥
SOURCE: “【AT】 なんで噛まないの？【百合】" by 空豆
http://www.pixiv.net/member_illust.php?mode=medium&illust_id=30261195