Notes:

The artist that made this wholesome image is called dannex009.
I can't link the source cause the source is very NSFW.
However, I can tell you that dannex009 has a twitter and pixiv if you want to go and find it on your own.

And here's the little story the artist wrote for this image

"In the Year 1191, Byleth and Lysithea of the Royal House of Eisner of Fodlan went out to enjoy a day away from their duties as rulers with their daughter and heir, Princess Lyla Eden Eisner to get some fresh air and enjoy the peace they have fought hard to earn for themselves and the people of Fodlan. As they watched their daughter play and marvel at a nearby flowerbed, the royal couple can't help but smile with pride and love in their eyes."