Click flag 2 times cus like i made an intro for no reason LORE: you are fighting sans during the geno route, when suddendly, time and reality breaks and DUST SANS appears. when they see each other, they both get very confused. they notice that they're a version of themselves in another timeline, but sans notices the irregularities of dust, and as the fight goes on, sans ask more and more questions and in the end he realises what dust has done, and knowking he's a version of him in another timeline, he adknowledges that he's going to become like him someday, and just that thought scares him. In the end, when they both are too tired to keep fighting the human, dust forces sans to kill him to get all his exp and keep fighting. Dust believes that he's an anomaly in sans' timeline, so he finds it right to be the one killed instead of sans.
EVERYTHING HERE by me :P If you want to use anything here, make sure to credit me first. i decided to put classic and dust since even tho they are different au's, they're actually just different timelines of undertale, and since time paradox is just "sans of a timeline + sans of another timeline" i thought it would've been a pretty good combo. (also HOLY i did NOT know i was this good at drawing :face_holding_back_tears:)