Story

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Sans was walking in snowdin when he found Flowey. Flowey was on the ground unconscious and slowly dusting. He quickly picked up the flower without the ability to remember what he did to everyone, and teleported him to Alphy's to see if she could fix him before he dusted away. Alphy's told sans' that "the flower" needed a soul as it had none and thus that was why he was dusting away... she then explained to sans' about the "tests" with Flowey. Sans' was willing to give his soul, and Alphy's injected him with Anaesthesia and he fell asleep. He awoke surprised he was alive, and heard a voice a couple seconds later

"Where am I?"

The Flower was in his left eye. Sans jumped out of his seat in panic, but Alphy's told him he needed to relax and that it was fine. Alphy's explained that all she had to do in the end was attack Flowey's vine's to his soul and they could both live instead of sans' sacrificing his life. Flowey and sans' got used to it after a couple of minute's, and then sans' (and now Flowey's as well) soul started to feel really good. Alphy's explained that the feeling was because of the vine's and would be permanent and that they would be stuck together until their soul break's, which would result in death for both of them. Sans' went around to his friend's place's to show the what happened and everyone accepted it except for Papyrus who was worried about his brother's health.

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Side stuff

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*Flowey can feel emotions due to sharing sans' soul

*Sans' and Flowey always knows what the other one's thinking (again soul-sharing)

*This is 5% inspired by how they brought Asriel back in Endertale, 95% inspired by the "Flowey possession" fan-art's and AU.

*I farted 24 time's while making the sprite and 7 while animating it, leading to a grand total of 31 fart's.

*Flowey has shared control over sans' body

*Flowey x Sans Papyrus' is jealous because Sans' and Flowey are so close, so he make's MK his BFF and goes nowhere without him

*Flowey tells Toriel and Asgore (after asking sans first) that he's Asriel.

*Toriel and Asgore get back together and enstate that no human is to be harmed with the punishment being handcuffed to Jerry for a day (they're hard on their law breaker's)

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That's literally it lol Sans x Flowey