(At the entrance of Stop & Slurp)
Mabel sat close to the door of the store, where Marco came out of there holding two drinks. Once he spotted the girl, he put on a rather obviously faked tone of surprise, "Oh my gosh, aren't you one of the heroes of Gravity Falls?!"
The girl cracked an amused smile and nodded. Marco immediately bowed as he handed the girl his remaining drink, "Here you go, your heroness, please honor me by taking this drink I obviously didn't buy just for you."
Mabel chuckled as she took the drink and took a sip alongside Marco, who continued to drink as she reached for her back and told him, "I got something for you too, Marco."
Once the guy finished his drink, he took a breath of relief before he saw Mabel's a gift: a white sweater with a black line near the waist saying "Karate Overlord" in black and white letters, with glitter included. Marco immediately put it on and, after seeing that it fit him perfectly, he lifted Mabel, kissed her and gave her a tight hug, which she shortly returned in short order with a couple pats on the back.