Being a dragon has meant that Spike has always had to cope with many things that have set him apart from the ponies he has been around his whole life. But of all those things, none was quite so significant as what began on the day he reached adulthood. For on that day, he began to view his friends in a whole new light, forcing all seven of them to come to terms with a rather unexpected change to their relationship.
Spike's crossing into adulthood brings about an unexpected change to his friendships.
Fluttershy gives birth to her and Spike's child