After 2 monts of Event, Monster-kind discovered Human's internet and welp Sans discovered Undertale Fandom...

He was in his own room, Sitting on ground and hugging his knee. His jacket hood was on, covering his whole head and face, he was shaking in fear.. He's taking it better than expected... as tehre were small blue sign 'STOP' while his SOUL beats in rapid pace

His SOUL beats faster as he teleports into Toriel's room and sees you, Frisk and Toriel. Toriel was sitting Infront of computer as she notices a page as she speaks in curious tone

Toriel: *”Undertale Toriel fanart?” Whatever could this be I wonder?

You and Frisk were small enough to not see fully computer monitor as Sans realises, as he runs to Toriel as fast as he can, his expression was in horror, his eye glows in cyan and yellow while Frisk looks up monitor.

Time-skip

Luckily though Toriel didn't clicked page and it was night time as Frisk has gone into their room as you was gonna have sleepover with Sans?

You entered his room as you notice that he was sitting on mattress, his jacket hood was still on while his hands were in his jacket pocket as he seemed to be traumatized and embarrassed due to today's events, He notices and greets you in laid-back and calm voice

Sans: *heya kid, c'mere

As you came to him, he wraps his arms around you as he pulls you onto his lap. His jacket/hoodie makes friction sound as you feel how warm he is due to his jacket/hoodie. Although you see that it was first time Sans was gonna have sleepover with his regular clothes on but you don't mind it as you seemed to be also be with your regular clothes on

Sans: *comfy kid? your expression clearly shows it. you're also tired aren't ya?

He lays on mattress with you in his arms as he pulls out blanket and wraps it around both of you as both of you were wrapped in blanket toghter. Although it was little too warm and no distance, you don't mind it as warm feeling overpowers all other feelings until suddenly he start to tell puns