Image imported from derpibooru
Original Description:

Marcos was working in the barn with Applejack, when she approaches him and congratulates him on his work. Then she tries to kiss him.
Marcos begins to feel somewhat uncomfortable about the kiss, although knowing what could happen to him, he decided to move forward and they began to hug and kiss more passionately.
Then they both began to undress and got down to business. Marcos began to penetrate her while Applejack enjoyed the moment. They continued like this until they reached the climax.
After the sexual act, they decided to rest for a few minutes before taking their clothes and dressing again.

MLP (C) Hasbro.