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Sora didn't think that inviting his close friend Ariel to the beach party scheduled on his home of Destiny Islands would cause these feelings. Seeing Ariel stroll out showing off her beautiful body in her bikini; confused at the stares that the nearby boys and some girls were giving her... She was pretty much wearing what she had before when she is in her mermaid form but with a bikini bottom so she still was wearing what was normal for her.
He had seen her like this before as a mermaid so he was asking why he was thinking these thoughts with the red in her face; maybe with them older and seeing her body out of the water...
Kairi and Riku noticed and decided to be coy; 'accidentally' tripping Sora right at Ariel with him falling and his face landing near her chest. Sora giving them an annoyed look up as the two were red in the face.
Sora was helping out a friend when he agreed to be Jasmine's 'protector'; basically an obscure section in the laws of Agrabah where he would basically be a sort of bodyguard who would be accompanying her as she would be allowed out of the palace and to explore the other worlds. As a Key Bearer; it turned out that he fit the criteria. It also turned out that it would make him the next choice for a suitor if Jasmine didn't choose from a visiting prince...
But it would just be helping out a friend if it came to it...
them walking together through the streets of Agrabah; Sora smiling as Jasmine stopping to help anyone in need. Not even thinking if a small kid asked the Princess and her 'boyfriend' if they wanted to play. Made Sora red and Jasmine would just chuckle amused but wouldn't try and correct the children. Or paying for food if she spots some hungry orphans and giving them money for shelter with Sora looking at her in admiration.
Things did awkward whenever Jasmine and Riku were in the same proximity together; Jasmine would give him a glare and clearly didn't forgive or forget him kidnapping her for Maleficent. Neither Sora or Riku could blame her for that. Though Jasmine noticed looks that Riku would give to her and would even look jealous when she was with Sora; deciding to toy with her former kidnapper taking Sora's arm in her's or putting red on his cheeks by kissing him on it. Taking some delight in the jealous looks from Riku.
Sora was telling himself that she was just doing this to get back at Riku.
Spending time with Elsa in Arendelle and hearing her annoyance at some advisors and ambassadors from allied kingdoms suggesting that she find a suitor. Sora relayed the story of finding the 'protector' loophole and did offer to help find anything that she could use to push back the discussions. Elsa's sister Anna noticed some jealousy on her sister's face when Sora brought up being Jasmine's suitor if she didn't find a prince. Finding her looking through the books in the library; she teased if she was trying to find a similar law and Elsa protested any such thing.
Sora knocking at her door to ask her to come down as she had a visitor from another kingdom; seeing her brushing her hair and staring at her with her hair down. Elsa asking what she thinks of her hair down like that and Sora admitting that he found it nice; trying hard not to think of how more beautiful she looked like it.
Elsa started having her hair down after that and would just excuse it with 'wanting to try it' when asked.
Three of his female friends confessing to being in love with him on the same day was not what Sora ever expected and it made the moment awkward. Especially as even then; he was trying to deny to himself that he had crushes on all three of them. He never expected that they would like him in return.
If you asked his friends (especially Riku and Kairi) and anyone else who saw Sora with either of them then they would say that it was pretty damn obvious. From Anna asking her big sister if she wanted Sora to dance with her when Anna and Kristoff would get married, to the people of Agrabah already assuming that Sora was Jasmine's suitor to Ariel's family asking if she would still come and visit once she and Sora were parents.
The three women were shocked but agreed to talk it over maturely with eachother and Sora with him admitting that he he had strong feelings about what to do. They let Sora have all the time in the world to think it over and assured him that it wouldn't affect their friendship with him whoever of them he chooses if it was one of them...
Sora couldn't choose and an idea from them led to...
Years later Sora would be married to all 3 of them; Ariel affectionately hugging him in bed to the side, Elsa resting on him as the Snow Queen's body heat was ironically relaxing to Sora and Jasmine having Sora rest her head on chest when she would wrestle away from the other side of him.