This chapter is more Dipper oriented, and does involve WenDip/WendyxDipper. Be warned.

Dipper POV

I lay down onto my bed, my hands resting on my stomach. I blow air out through my lips, making them make the noise you would hear from someone who was clearly board. Much like I was. Since Soos was running the Shack now, Stan was only a visitor, and couldn't make us work. Him and Soos had left over an hour ago to go see a movie. He left Wendy in charge to look after the gift shop, and made me and Mabel help. But, knowing Wendy, she let us off the hook, and closed up. But even though I liked the idea of a day off, I just had nothing to do.

"Ugh." I say to no one in frustration, "There's nothing to do! I'm so board."

"Well, why don't we have some more fun?" Mabel asked, suddenly in the room.

I sit up in my bed and look to the doorway and see her already taking off her sweater.

"Mabel?! What are you-" I try to say in protest, but Mabel would not give up so easily.

"Oh come on!" she shouts at me, "We're all alone in the Shack! Stan and Soos are gone, Wendy is probably with her friends. Let's do something! You said you wanted to wait, and we have. I want my Dipping Sauce all to myself!" She's standing there with her head cocked to the side, and her hands on her hips, waiting for me to comply.

"Well..." I think of a way to get out of it, but Mabel looks so cute when she's mad. I can't say no now.

"I guess there's no use arguing..." I finally agree.

Mabel gives a small, girly squeal of excitement and leaps onto my bed, trapping me under her legs. She then rips off her top revealing a pink, lacy bra with flowers on the corners.

"Wait Mabel! What if Wendy was to come up here?" I ask her, worried about the possible disastrous outcome.

"Ugh. Fine. We'll do it under the covers." Mabel sighs, "Is that good enough for you, sir?"

I give her a sly look with a half smile. "Yes Mabel," I say sarcastically, "That will be good."

With that, Mabel hops off my stomach and pulls the covers back, forcing me under them, and then subsequently jumps under with me. I then go for her bra, unhooking the straps, and tossing it onto the floor. I can't believe we're finally doing this. Is all I can think as Mabel pulls my shirt off, and I grab onto her breasts. She gives out a small moan of satisfaction, and I start squeezing them around, and enjoying her sounds of arousal.

"That feels amazing..." Mabel moans, with her eyes closed.

"Uhh, Mabel?" I nervously ask.

"Yes Dipper?" Mabel replies, her eyes still closed, enjoying me playing with her chest.

"I think... I'm ready." I choke.

"For what?" Mabel asks, curiosity opening her eyes.

"For you to-" I gulp hard with awkwardness. "Touch my, penis." I cringe at myself as I release the last word, and wait for her response.

Mabel is just staring at me with a surprised look on her face.

"Really?" she asks in disbelief. I slowly nod, and grab onto my boxer waistband.

"No no." she quickly says, "Allow me." Mabel reaches down to my legs and, rustling the covers, slowly removes my underwear, obviously enjoying my fidgeting. She grabs hold of my already hard member and I instantly let out a yelp of euphoria.

"Ooo. Someone's sensitive." Mabel playfully says, still holding on. She then begins carefully rubbing me back and forth, probably trying not to ruin the moment she's been waiting for.

"Mabel..." I groan, delirious to her hands.

"Keep saying my name." she commands. I'm experiencing to much joy to argue and I begin chanting her name.

"Mabel, Mabel, Mabel." She then begins to speed up her rubbing a little and I can feel a stirring in my chest, unlike anything I've felt before. Right when I think I've had enough, Mabel stops rubbing, and moves down so her head is in line with my crotch. She gives a little giggle, and when I open my eyes, I see her lick her lips with a devilish look in her eyes.

"Mabel?" I ask, but not before being silenced with the feel of Mabel flicking her tongue against the head. Ahh. This feels sooo good. I'm thinking. Mabel eventually puts it all the way inside her mouth and begins sucking carefully. I cannot believe this is happening. I keep letting her suck on my member, until I hear an unfamiliar noise.

"Mabel! Shh!" I push whisper as I push her away and quickly pull my boxers up.

"What, did I do something wrong?" Mabel worryingly asks.

"No, I... I think someone's there." I whisper into her ear. I slowly pull the covers back and peek out from under the sheets. What I see makes me freeze. Oh no. I see, low and behold before me, Wendy. Staring at me and my sister. In bed. Almost naked.

Wendy notices me and quickly turns around to leave.

"I'm sorry, I didn't mean to- I'm going." she says and runs out the door of the attic.

"Holy crap Mabel! That was Wendy!" I shout at her. "She saw everything! This is bad. Really, really bad!"

"Calm down bro." Mabel tries to interject, "I'm sure she-"

"No, Mabel you don't understand." I interrupt her, fear slicing through my words. "She knows about us. She must think I'm a freak!"

Mabel grabs hold of my shoulders and pulls me in front of her face, "Dipper. You need to talk to her. You won't know what she knows until you do."

I just look at her and a tear starts to form in my eye. I brush it off and sigh.

"You're right." I get up out of bed, put my shirt back on, and bolt out of the room, determined to clear the air. I have to convince Wendy that this was just a misunderstanding.

I see her in the kitchen, below the stairs, and I call her name. She turns to me, and bolts away, panic stricken. I quickly muster my courage, and give chase. Eventually, the sound of her footsteps lead me to Grunkle Ford's old room that Wendy sometimes crashes in. I walk up to the door and find that it's slightly open. I push it open a little more and peer inside.

"Wendy?" I say in a soft voice.

"Dipper?" she replies, sounding like she'd been crying. I creak the door all the way open and find her curled up in a ball, weeping, looking up a little at me. I walk over and sit down next to her, my head low. What do I say?

"I'm sorry," Wendy delicately verbalizes, "I didn't mean to interrupt. I just, heard noises and..." She quivers and her apology peters out.

"Wendy, don't apologize." I try to console her, "I should have told you. But, I guess you know now... About me and Mabel."

Wendy looks up at me and I can easily see tears staining her cheeks. "What's going on between you two? You're siblings!"

"I know that. We just... we just really like each other. And a week or so ago we decided to... date." I admit with my head low, ashamed that I had made one of my best friends cry. "I should have told you."

We sit in silence for a while as we both think of what to say.

"You know," Wendy finally spoke up. "It's kinda funny when you think about it. After I told you we couldn't be together, like, six years ago..." She kind of trailed off in her thoughts.

"Yeah?" I ask, intrigued in what she had to say.

She gave a big sign and continued, "After that, I kind of struck out with Robbie. He turned into such a jerk. I never really had any luck with guys after him. And then you and your sister started growing up, getting bigger every summer. Until..." Wendy briefly paused to sniff and brush a tear off her cheek, "Until... I saw you again this year. You looked so grown up, and I sort of felt something."

I suddenly perked up at this revelation. "But Wendy, I though you said-"

"Yes, I know what I said." she interrupted, "But it's different now. You're all grown up."

"So, what are you saying?" I ask.

"I..." Wendy looks up at me and places her hand on my cheek, "I think I... like you." I felt a shiver go down my spine. What? She likes me?! Why?! I just got over this girl, and now she's saying that she likes me?! Wendy notices my expression and, without notice, pulls my face to hers and we lock in a passionate kiss. She kisses me first, and I start to agree. Before long, she has her hands behind my back, and mine behind hers. I got to kiss her neck and she gives off a small moan.

"Oh Dipper..." she says, enjoying my change of pace. I stop for a moment and look back into her eyes. I then push myself away from her, and turn to my side.

"No, I can't do this." I tell her, "It isn't fair to Mabel."

Wendy POV

I watch Dipper's back as he hangs his head low, not wanting to even look at me. What have I done? I've ruin our friendship. I have to fix this. I place my hand gently on his shoulder and lean in to whisper in his ear.

"Dipper. I get that you and your sister are dating, and I'm okay with that. You two can do whatever you guys want to." I try to change Dippers mind, "But I know that you had a thing for me for a long time. Haven't you ever... I don't know... Thought about doing anything with me?" I pause to give time for Dipper to respond, but he doesn't, "I know I have." That made him turn around. A very confused look sprawled across his face.

"You, you have?" he asks me. I just nod my head with a sort of half smile. Dipper just looks down, lost in though and quietly 'wow's to himself.

"Hey," I say, trying to sound a bit brighter, "let's stop with all this emotion junk. I have an idea."

"What?" Dipper nervously replies.

"Why don't you show me what Mabel has taught you?" I say with a wide grin on my face.

"Oh alright. But!" Dipper says a little louder, pointing his finger up for dramatic effect, "Only if you promise not to tell anyone you know. Not even Mabel."

I respond by pulling him in by his collar to plant a large kiss on his lips.

"Deal."