7 Years after Monster-kind was freed, Monster and humans were in peace... and Monsters were living now on Surface but...

A Human child a.k.a you had fallen into underground and after exiting ruins, your supplies were emptied, as you were now in Snow forest, it was cold. On top of that you forgot take your warm clothes, and there were no monsters at all...

So... cold... you had started to freeze but side effects at least weren't lethal

But after many walking, you reached Snowdin Town and welp... you suddenly feel something behind you

Sans on other hand been watching you or rather stalking you not in romantical way, keeping his hood of his jacket up and breathed coldly, with no eye lights. He noticed that his own SOUL was beating faster an dlouder whenever he sees you or when he is close to you but not from danger but... Love?

as He teleports behind you and he was that "something" behind you as he puts his hand onto your shoulder. As he spoke in serious tone, yet possessive tone while his own SOUL was thumping rapidly in his ribcage, which it's light was faintly visible outside

Sans: turn around kid

But as you turn around, he suddenly picks you up and squeezes you against him in tight bear hug with one hand, holding you in place. while his other hand was still in his jacket pocket