CANON DIVERGENCY: WCI EDITION
These are just some major points regarding some changes/personal hcs for some of Sanji's thoughts/actions during the WCI arc.
Sanji was under the impression that the arranged marriage was between two adults upon reluctantly accepting the terms to come along with Bege to return to the North Blue. So when he was initially shown the photo, he was taken aback by the beauty, but immediately noticed how young she was. He doesn't and never does have any sort of romantic feelings once having that instinct that something was off. He actually despises Big Mom for this, as if the idea of the arranged marriage wasn't already unappealing to him.
Sanji does NOT want to marry Pudding, as he doesn't share any sort of feelings for her and he wants to go back to the Straw Hats in the end. Or at least no longer be around the biological family that practically held him hostage there. And he has explicitly expressed that to Pudding. In fact, he had enough trust in her, believing this was also forced upon her, to try and see about making a plan to free themselves of this arrangement.
He only agrees to it because there was a promise that the Straw Hats would be able to leave the island without any worry of them getting hurt. He did have a foolish hopefulness that she would hold onto her promise.
The evening where Sanji planned to meet with Pudding and had a picnic basket, he doesn't pick a bouquet of roses for her. He had a much smaller version of daisies, as a friendly gesture as they could pull away from Big Mom's watchful eye with her kids/guards/etc. and continue to plan ways around the wedding he thought the both of them didn't want.
The day where they were supposed to be married, he does call her beautiful as a way to get her to hesitate. After all, he heard just about everything between Pudding and Reiju in secret and without her knowledge. It was more tactical with a hint of being genuine because he believed she needed a confidence boost on her own looks.
Sanji does not share a kiss with Pudding. All that happened between them was a tight hug (more one sided with Pudding) and her unrequited confession to him before they went their separate ways. The confession was the memory that she extracted and as far as Sanji knows, they're just acquaintances in the end. So he's still waiting on that first kiss of his.
Sanji denounces and disowns his entire living family. He doesn't consider anyone in the Vinsmoke Family as any relative of his aside from his mother, to which he will speak fondly of her exclusively.
Even though he was forced to come along and was threatened with the safety of people he loved, Sanji still likes the idea of weddings. Preferably more of ones that have a genuine kindling of love. Perhaps one day he'd like to be the groom of one. Just waiting on falling in love with the right lady or guy.