Their relationship could become deeper. Ash has been through a war, and Serena's support during his return would make their bond stronger. They might be more reliant on each other.
At first, their relationship could be a bit strained. Ash has seen and experienced things in the war that Serena can't fully understand. But as he shares his experiences and she listens, they could grow closer. Maybe they start to see each other in a new light. Serena might see Ash as a stronger and more mature person, and Ash could see Serena as a constant in his changing world. Their relationship could shift from a simple friendship/romantic interest to a more profound and mutual understanding - based relationship.
It could be a bit rocky at first. Ash may have seen and done things in the war that have changed him. Serena will need to adapt to this new Ash. But if they communicate openly, their relationship can grow stronger. For example, if Ash has post - war trauma, Serena's support can help him heal, and this shared experience will bring them closer.
Their relationship would become more mature. They would have to rely on each other more than ever. With a baby, they'd have to share responsibilities, which could lead to a deeper understanding and respect for each other.
Well, perhaps Ash returns physically but is emotionally scarred. Serena would be there to comfort him. They could start by just reminiscing about old times. Then, Ash might introduce Serena to some of his war - time comrades who are also Pokémon trainers. This could lead to a whole new set of storylines involving group adventures, Pokémon battles, and the rebuilding of relationships that were strained during the war.
Their relationship might start off with a lot of pent - up emotions. Ash could be a bit distant at first due to his war experiences, but Serena's love and care would gradually draw him out. Eventually, they would become closer as they share their feelings and experiences during the time they were apart.
Their relationship would become more centered around the family. They'd have to communicate even more to take care of the baby. For example, deciding who takes care of the baby at different times.
After marriage, their relationship would likely become more domestic. Ash, who has been constantly on the move, would have to adjust to a more settled lifestyle. Elesa, on the other hand, would have someone to share her daily life with. They would probably support each other's careers more closely. For example, Ash could help Elesa with her Pokémon training for any fashion - related Pokémon shows she might be involved in, and Elesa could use her influence to promote Ash's Pokémon battling achievements.
It could be developed through more shared adventures. They might go on a quest to find a special Pokemon or a hidden place. This would give them more time to understand each other better.
Their relationship would likely grow closer. At the dance party, Ash might be a bit clumsy at first, and Serena would gently guide him, which would create some sweet and tender moments between them. They would share laughter and maybe some embarrassed blushes as they interact more intimately during the dance, deepening their bond.
It could make their relationship more complex. If Ash uses the control in a positive way, like helping Serena improve her skills, Serena might initially be angry or confused but later come to appreciate it. This could lead to a stronger bond as she realizes Ash was trying to help her all along.
They would probably be a bit shy at first. Ash being his usual energetic self but also respectful of Serena's space in the tent. Serena might be a bit nervous but also excited to be sharing such a close space with Ash.