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What do you think was going through Sans’s head, what he was planning and what he’s goals where?

It's a weird line, and one that only keeps feeling more out of place the more we learn about Sans.

It's clear nowadays how hesitant Sans is to fight at all (especially after the UT anniversary stream) so it's incredibly unlikely that there was much weight behind the threat. Yes, he'll fight you under the most dire circumstances, but he already knows he's doomed if you don't just get bored or frustrated. I don't think he'd threaten/entice you into a fight he knows he can't win.

It was less clear at the time the game came out. How much did the promise change how he would've behaved? What are his real motivations? That sort of thing. Maybe adding to the mystery of Sans was also some of the "point" of the line being so intense. I've talked before about it being important for Sans to be a somewhat grey character for his judgment at the end to be effective.

So my guess for the context of that line now? He's not talking about himself, being eager to kill you or anything. He's saying that without Toriel caring about you first, he wouldn't have cared about you, and then maybe without Sans' slight encouragement Papyrus wouldn't have cared about you. Without Papyrus, you don't get the date with Undyne, and so on...

It's not "if I hadn't sworn otherwise, I would've killed you." It's "this world would've been crueler without someone caring." There's a Toby quote from the anniversary stream about "caring because someone I care about cares" being an important concept that I think ties in here.

The end of the Sans dinner date ends with the line "take care of yourself, kid, 'cause someone really cares about you".

It could be just Toriel he's talking about. Or-- depending on your run-- everyone in the chain, including himself.

What if they slowly remember their memories of being humans...

What if the accident was while they were on vacation in a far and foreign place so nobody really knows

What if even for a moment Felix was still conscious and saw what happened to them while Adrien died instantly

What if that makes Felix has thanatophobia (inspired by @sentifelix headcannon, yes I love this hc) when he suddenly remember his past live

Felix, naturally, gets wind of this and goes down to Paris to set the record straight, assuming his uncle is up to his old tricks again.

Once the three identical boys all end up in the same room, Felix attempts to prove that he’s the real him by having the ‘real’ Adrien ask him and his imposter obscure questions that “only the real Felix would know.” Of course, if past!Adrien knows something enough to ask about it, future!Adrien knows enough to answer it and they don’t get anywhere fast.

It’s all just such a big mess that Ladybug gets involved to sort everything out. Creative person that she is, she figures out how to make a Sentimonster Detector that can prove who’s the fake. All three boys, of course, register as “sentimonster.”

The sheer scope of Gigantomachia’s rampage gets lost without the cultural context. A quick google search clarifies that he ran through about 170 km without any civilian evacuation by the heroes because they were mostly at the raid of the PLF. The civilians in BNHA are rarely particularly sympathetic, but it makes sense why the public largely stopped believing in the heroes, took matters into their own hands, and raked the heroes over the coals for this. Why wouldn’t they? From a bird’s eye perspective, the heroes picked a fight with the villains but bit off more than they could chew, and the civilians in the Kansai region paid the majority of the price for the heroes’ mistakes.