Not much to be explained besides Mac X Fluttershy and their kids. Well, what I think their kids could look like at least.

Pegasus - Gentle Breeze
Earth Pony - Smooth Peach

“You named me Smooth Peach, and I have a pink mane and tail!” The young filly waved his tail around.
“It’s not pink, it’s peach.” Fluttershy said calmly and proudly. “And I named you that because you were just like a little peach when you were born.”
The filly blushed in embarrassment. “Mom don’t be so weird…”