After your brother Asriel was taken away from alphys lab to get juiced after turning into a Blueberry, you finally saw your goat brother again... But he was different from you two entering alphys lab He wasn't so bloated as a Blueberry of course... But now asriel has a thick and obese shape now, it means that there's a lot of Blueberry juice inside of her... well, better than nothing In more, asriel even gets tall at the same height of your dad's, to equilibrate the amount of juice inside of him Plus, alphys recommend that Asriel will wear just a tracksuits complete, or anyway the same elastic materials on other clothes, and wear only open shoes if he wants

Asriel: I'm so fat and full... I can hear the juice inside of me Slosh Glunk