Vol2/Chapter05/If You Love Something Very Much...

Summary
Gray and Silver reach Magnolia and head over to Fairy Tail. Silver's magic reacts to Mira's demon blood but Silver is able to control it. He joins Fairy Tail requesting that his guild mark be placed in the same place as Gray's.

Gray goes off in search of Natsu and finds him at the site of the home they plan to build. Natsu informs him that he and Happy will be leaving for his training trip in the morning.

Gray asks him not to go but Natsu will not change his mind. He tells Gray that he is free to learn Devil Slayer magic if he wishes but that he will cease to be the same person and therefore Natsu will no longer be able to be with him.

Natsu feels he made a mistake mating with Gray the previous night as he now believes that they were not yet ready to take that step. He thinks that their relationship has moved too quickly as a result of his capture and Tiamat's claim on him. He is not convinced that Gray really wants the same things as he does and tells him that he has a choice as both the mating and the soulbond can be undone.

Even though Natsu no longer has a chance to love someone different the same is not true for Gray and Natsu is determined to not trap the ice mage into a relationship he might not really want now that things are different.

Gray finds out that the price for breaking the soulbond is that Natsu has to revoke his claim to Gray in this life and all other, they would never be able to be together again.

He wants Gray to think about this while he leaves on his trip and give him an answer upon his return.

Natsu plans to search for Zeref to try to get some answers to his questions and Gray tries to warn him of the foolhardiness of this plan.

Gray realizes that there is nothing he can do to change Natsu's mind and he accepts it choosing to spend as much time with the Fire Dragon Slayer as he can before he leaves.