Suzuhebi Kyuuairon

Komazu, a sparrow, encounters a snake in the forest one day. He thinks he will be eaten, but to his surprise, Shirato, the white snake, saves him from a crisis. They slowly start to understand and approach each other.

However, Komazu accidentally sees those. Between Shirato's thighs, there were two of what a sparrow does not have!!! As interested as he was, he starts playing with the things between Shirato's thighs. But as they spend more and more time together, he feels the desire to mate with Shirato, and those feelings lead to an ending where they are once again reminded of the differences they have as different species...

(Source: Printemps Shuppan, translated)