Stitch Sans feels a disturbance again. He's not sure where it's coming from. 

It's making him agitated.

Confused.

Annoyed.

(TrueSaiyan) "Wait,what do you mean you USED to be the original Sans from Undertale...?"

Stitch Sans shrugs. "I mean I used to be the Sans from Undertale. The very first one. Making sense?"

He tries to pinpoint the spot where the disturbance is coming from. It doesn't feel like a cracked timeline.

No, definitely not a cracked timeline.

It doesn't feel the same. 

It's not a rip in the fabric of space and time, either.

Not a thread snapping.

(Blurple514) "Ah. You definitely are a Sans, Stitch. And you probably are the original one, I'm gonna ask you about that later... But I have ANOTHER stupid question. But do you remember how you arrived in the void? And how long has it been since you began caring for the timelines?"

"Well..." Stitch Sans feels uncomfortable, "arriving in this void...timeline was a pretty scary experience for me. I wasn't sure what was going on."

Stitch Sans remembers his echoing cries for help...

Looking around, only to see what would be recognised as the centre Undertale timeline and his former one...

Crying out again...

.

.

.

*but nobody came

Stitch Sans shakes his head, clearing it of the memory temporarily.

"As for how long I've been caring for the timelines...hmm..." Stitch Sans mumbles, "time is confusing here. For me I'd say a very long time...but for you, maybe two or so years? Ever since the first one of you beings recognised Undertale as a Universe."

He starts floating to where he thinks the disturbance might be. His right pupil (which looks like a clock) is going a bit bloodshot from the strain it is attempting to find this disturbance. He's putting all of his power into finding it.

"But your questions aren't stupid," Stitch Sans chirps, "you're quite inquisitive."