Infiltration
Porco Galliard was in the middle of the Jeagerist home base, surrounded by members of the Jeagerist army while also dressed as one of them. Nobody had found him out yet, thankfully, but Porco really wasn't worried about that. He was more worried about his girlfriend, Pieck Finger, especially as he had just seen her climb up the stairs while chained to a Marley Warrior in Training, Gabi Braun, and the leader of the Jeagerists, Eren Jeager. Sure, Pieck looked happy and confident, but with what he had heard (and experienced) against Eren, being worried for her life wasn't an overreaction.
Porco was so worried that he couldn't focus on the voices that were all around him, coming from confused and, much to his chagrin, aroused members of the Jeagerists. Porco had to fight any urge to beat these guys staring, cat-calling, and making sexual remarks about his girlfriend up. Porco ran down the hall and to another room on the first floor of the Jeagerist compound, hoping to hear the signal that Pieck had told him to be on the lookout for. Pieck wasn't a fighter like Porco was and was more of a Marley Warrior for support. Therefore, Porco was worried about what a trained fighter like Eren would do to her, and the stress caused him to run his hands through his sandy hair.
Porco wasn't an overly friendly and popular person, that would be his older brother, Marcel. Everyone always wanted to hang out with Marcel, talk with Marcel, and get advice from Marcel, while he was left in the shadows as the little brother. Porco never resented Marcel for it, but he couldn't deny feeling a tinge of jealousy that Marcel was always the star in the Warrior Unit's eyes. Pieck, however, did make him feel special, ever since they were children. Sure, Pieck was friends with Marcel, but Pieck was friendly with everyone on the Warrior Unit, even towards people he didn't necessarily like, such as Annie and Reiner. However, Pieck always seemed to spend the most time with Porco, as the two often had their lunch breaks together, trained together, and even bunked together (much to Porco's embarrassment once Marcel had heard about it and teased him about it).
Porco wasn't sure what he would do without Pieck, especially since she had been such an important part of his childhood, almost as much as his parents and Marcel had. However, just as Porco's mind began drifting to the worst-case scenario, Porco heard three loud stomps from above him, and his body almost sagged with the relief washing over his body. But Porco didn't have time to be happy, as this signal meant that Eren was prime and ready to be stopped. Porco's mouth turned to form a proud smile as he grabbed a knife from his pocket, and while jumping up towards the ceiling, cut his hand to transform into the Jaw Titan, praying that this would be what they needed to stop Eren from destroying the world.