One day, the members of Fairy Tail got bored of watching Minecraft Diaries. They found a new show called RWBY. They were so obsessed with it, and then Igneel found a portal in to the world of RWBY. The following happened:

Natsu falls in love with Weiss. Weiss' sister, Pyrrha, who is a pile of dust (Yay!!!!!), is found by Ichiya, and he uses his magic to make her alive again (nooooooo!). Ichiya and Pyrrha live happily ever after.  They have a child named Professor Ozpin, who later marries Wendy. So Natsu and Weiss were the aunt and uncle of Wendy and Professor Ozpin.

Zeref falls in love with Nora. They give birth to Carla and Glynda. Glynda marries Achnologia and Carla marries Jaune.

To be continued...