From the artist's DA page:

Only two left to make in this "How They Met" series! And since we already know how Applejack, Big Mac, and Apple Bloom's parents met, thought I'd get this one out of the way. I did have fun working with the poses of Bright Mac and Pear Butter (I went through three complete sketches and just didn't like the way they looked until I fell in love with this image). Now, I will admit, I didn't put 100% effort into this one since I didn't have as much creative liberties as with the others. Still, it was fun experimenting with poses and whatnot.

I'm not going to go into a backstory here like I did with the others (because, again, we already know their backstory), so just enjoy the cuteness! :D