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Sans woke up drowned in agony. Serifa was sleeping next to him with a smile on her face. Trembling, he checked her pulse. Everything seemed normal. He sighed in relief.
-So, that's as far back as I can go... he thought to himself.
He had to think of a plan. A plan to change what had just happened. According to the previous timeline, Sans would leave in a few minutes. Then, he would return in about half an hour, to find the dead Serifa. That meant that they had about 20 minutes to leave the house, before the Royal Guards would show up. They had to hurry.
-Serifa, sweetheart...Wake up. Sans shook her decisively.
-Good morning... she yawned.
-Good morning...come on, let's go!
-Not yet...I'm so tired...
-But you need to get up! We have to...buy the ingredients! For the cake! We promised...remember?
-Can't we do that, like...a bit later...? I wanna sleep more...
-N-No! We have to be early!
Serifa mumbled something in a sleepy voice. Sans had no time to spare. They really needed to hurry out. He pulled away her covers and dragged her out of bed using force.
-Get up, get up and don't be lazy! Sans tried to sing in an attempt to cover for his inexplicable behaviour.
An unseen figure chuckled, but nobody heard it.
-What on earth Sans...
Serifa could barely keep her eyes opened.
-Here we go!
Sans grabbed her hand, without even letting her put shoes or any jacket on. He started running out of the room and down the staircase.
-What are you doing? I'll fall! And I'm still in pijamas!
-You'll be fine, just come with me!
-Seriously, what's with you today...
Sans opened the door. However, before they even managed to take a few steps out, magic attacks from the Royal Guards flew past him. He heard Serifa's scream and, the next thing he saw was her wounded body falling. He caught her mid-air, but she was already unconscious.
-Serifa! Wake up! Serifa!
Checking her pulse, he realised it was too late. Serifa had, once again, died. Sans had failed. Panicked and without thinking carefully, he did it again. His left eye flashed.
Sans woke up again for the third time, right next to the sleeping Serifa. This time, however, he had a terrible headache. He realised he shouldn't have time-leaped so soon after the last time he did it. Unable to even stand from the pain, he stayed lying in bed, thinking.
-As soon as we got out, they attacked us...That meals they must be waiting for us to get out...or to separate. he thought. In that case, I'm staying right here with her. It's not like I have enough power to attack them anyway...
Sans had exhausted his powers with the two consecutive time-leaps. He somehow had to recharge, but sleeping was out of the question. He had to stay alert and protect Serifa. Therefore, he just sat on the bed, watching over her.
When the bell rang, Serifa was still asleep. Surprisingly, the bell rang a lot later this time than when it rang in the first timeline. Sans walked out of his bedroom, closing the door behind him.
-Guess they got tired of waiting for a good opportunity...
Sans walked to the door with an unseen figure following him. He was feeling very dizzy and was in absolutely no shape to fight. He opened the door to find the two Royal Guards.
-Good morning Sans! We need to search your house!
-Wow, at least ask me how I'm doing first! Sans tried to buy time.
-Sorry, Sans. It's just that we have orders from Undyne, and we are already late...You know how she is when we fail!
-Trust me, I do... Did my brother come to his training today?
-Yes, I saw him earlier when Undyne sent us out. Now please, let us in.
-What are you looking for?
-Undyne told us a human has hidden in here.
-Well, I haven't seen any humans around.
-Undyne said that she has probably hypnotised you to believe she is an old friend of yours. Do you have someone like that here?
-Nope, you've got the wrong place. Sorry.
-We still have to search. Let us in, in the name of the King!
Sans was at a loss for words at this point.
-W-W-Well, I can't let you in...the place is so messy and...
-I'm afraid we'll have to insist.
-Sans? Who are you talking to? Serifa sleepily asked, appearing in the top floor's corridor.
Serifa's voice was the last thing Sans wanted to hear at that point. As soon as she showed up, the Royal Guards attacked her with their magic, killing her instantly once more. Sans didn't lose any time. Before the Royal Guards even managed to get to her, Sans's left eye started flashing, but immediately stopped. He was too weak to go back again in such a short time. Instead, all he could do was watch them take away her soul.
His eyes grew teary again. In just a few hours, he had seen his beloved Serifa die three times and wasn't able to save her. He felt useless and weak. Seeing him like this,he Royal Guards interrupted his thoughts.
-Don't worry, Sans. Humans are powerful. It's only normal to be hypnotised by them.
-Yes Sans, even I would probably get hypnotised in that case, and I'm stronger than you...
Sans was barely paying attention to them. He didn't care what they had to say. All he cared about was for some time to pass, so that he would be able to go back again. To see her alive and to save her.
But the Royal Guards had known Sans for a long time and hadn't seen him so down even once. They felt really sorry for him, so they kept trying to cheer him up. That was when Sans thought of something. Since he couldn't go back yet, maybe he could use them to fish for some information for later usage.
-Guys...please tell me... How did you find out the truth about this...imposter?
It broke his heart and soul to talk like this about Serifa.
-Yesterday night, a Royal Guard who was searching for the human came to Snowdin. He said he saw Grillby's being way more crowded than usual and he went in. There, he saw the human dancing with everyone. By asking, he learned that she lived in your house as ''a friend from the capital''. When he reported this to Undyne, she immediately understood that you, and maybe even the whole Snowdin, has been under her hypnosis. So, she sent us here to eliminate her as soon as possible. She was so dangerous after all!
-I see...and how long have you been waiting outside my door?
-For a lot of time, actually. The sun was rising when we came. We didn't want to involve you in this so we waited for someone of you two to leave first. But you took a long time, so...
-I understand...
Sans was disappointed by what he heard. The reason Undyne learned about Serifa, and even the Guards' appearance outside his doorstep were both things that happened before the point in time he could go back to. They were both facts that couldn't be reversed, so he had to find a good plan instead.
As soon as they Royal Guards left with Serifa's body, Sans was free to drown in his tears again.
-Next time...I'll definitely do it...I'll save you...
He noticed he had just enough power to go back. His left eye flashed.