Mabel and Robbie get together in this one. Credit goes to me AND Tabbypie101. I DO NOT own Gravity Falls.
-MEANWHILE-
Mabel eventually got to Robbie's house and started pacing back and forth across his porch deciding whether or not to tell him how she felt. She eventually couldn't take the tension anymore and decided to knock on the door.
Robbie opened the door and was surprised to see Mabel standing there. "What are you doing here?"
"I need to tell you something before I leave." Mabel said.
"What is it?" Robbie asked.
Mabel looked down at her flats and twisted them around, playing with the ends of her sweater," Ummmm...I... Ummmm... I like you."
"You do?" Robbie asked.
"Yeah..." Mabel said not looking up from her shoes.
"Oh, well I ... Kinda... Like... You too." Robbie said.
"What...?" Mabel asked looking back up in shock, but in a good way.
"Yeah, I thought you were pretty cute when I met you and after that I slowly started to like you more." Robbie said.
"What about Wendy?" Mabel asked confused.
"I do still like her a little, but she's with Dipper now." Robbie said
"Oh..." Mabel said trailing off.
"Yeah..." Robbie said, also trailing off.
"Can I kiss you?" Mabel said bluntly all of a sudden.
"Um...sure." Robbie said.
Mabel stood on her tip-toes and tried to kiss Robbie, but couldn't quite reach so Robbie leaned down and his and Mabel's lips met. Mabel eventually pulled away and despite how much she knew he would hate it, she hugged him, but she only reached his waist. Robbie was shocked at first, but decided to return the hug.
"...I love you." Mabel muffled into his black hoodie.
"I... I love you too." Robbie said.
Soon, Wendy and Dipper's concert finished and they went looking for Mabel," MAYBELINE ANDREA PINES! WHERE ARE YOU?!" Then Wendy remembered that Mabel said she was going to Robbie's house so they went over to where he lived and Wendy opened the door. They saw Robbie hugging Mabel and telling her that he loved her, but Robbie didn't know they knew that Mabel liked him. Eventually, Robbie saw Dipper and Wendy standing not too far away, so he stopped hugging Mabel.
"Guys, this isn't what it looks like." Robbie said quickly.
Wendy knew, but she was bored and felt like tormenting Robbie, just like a true friend would," So what were you guys doing? Do you like her?"
"We weren't doing anything and so what if I do like her." Robbie said.
"Oh my gosh! I'm so happy for you!" Wendy said hugging Robbie and left him standing there very confused.
"Wait, you are?" Robbie asked.
"Well, you guys both deserve to be happy with someone that really likes you and from what I can tell you two really like each other." Wendy said smiling," Also, did you really think age is a factor for me when I'm dating Dipper? You're my best friend and I think Mabel might actually be able to bring out the best in you."
Robbie smiled "Well, thanks Wendy."
"You're welcome. Now what are we going to do now?" Wendy asked looking at the group.
"Go back to the shack?" Dipper asked.
"Yeah, sure. Robbie, Mabel come with us. Ok?" Wendy said.
"Okay." Robbie said.