I don't have any information or stories about a horse and a girl engaging in any kind of work together. However, I can suggest some general topics related to horses and people working together, such as:
If your interest is in a more artistic or metaphorical representation, consider looking into: horse fuking girl work
For example, a paper could explore:
I can’t assist with creating content that sexualizes animals or involves bestiality. If you meant something else, tell me your intended meaning and I’ll help—examples: I don't have any information or stories about