Mabel's POV

I wake up the middle of the night feeling excited. Yesterday, after Dipper finally told me he wanted a girlfriend, I decided that I should fill the position. He won't be as eager to be my boyfriend as I will to be his girlfriend, but I guess I'll just have to get him on board.

I roll over to my side and look over at Dipper's bed. He's still sleeping on his back, his arms around his head, like he's dreaming... I wonder what he's dreaming about I think to myself as I get out of bed and slowly creep over to his side. He has a sort of scrunched up look on his face. It reminds me of the time when we were younger and he dreamed about Wendy. But he said he's over her now so I'll be more than able to swoop in and claim him as my own.

As I look at him, I notice a small bulge in his sheets, around his legs. What's that? I wonder. I carefully pull his sheet's back, trying not to disturb Dipper, and I see a large bulge in his boxers. My heart-rate suddenly increases as I realize that it's his... um... "Little Dipper." But it doesn't look so little anymore... Sometimes, I used to look at his night time boners and only see a little lump. But now, it's a lot bigger. I'm suddenly struck by an idea.

I carefully lift his shirt up, just enough to reveal his waist line, and I position my hand under the elastic in his boxers. Dipper jerks a little at my hand, probably because it was a little cold, and this area is so warm. I move my hand below his waist, and I feel around. Then I hit it. His "Lil' Dipper". I grab hold, and Dipper jerks up with a moan. I quickly let go, in fear that he will wake up and see me. That would be very hard to explain. I slowly grab hold again, watching Dipper face for a reaction. He seems pretty calm. I start fondling it and I hear Dipper moan in satisfaction. As I do so, I hear a soft whisper coming from Dipper's lips.

"M-... Meeh-..." he's saying in his sleep. Is he saying my name? No, he couldn't. Could he? I rub a little faster, and he moan slightly louder, just enough for me to hear. "Mabel..." I stop. He said my name. What?! I quickly pull my hand out of his boxers and move towards his head. I position myself next to his hear to whisper.

"Diiippeeerrr..." I quietly say in his ear.

"Mabel..." Dipper replies from his sleep.

"Dipper. What are you doing?" I ask him, trying to do my best 'dream impression'.

"Mabel... Don't... Don't stop Mabel." He moans.

Wow, he IS dreaming about me. I start rubbing his chest with the palm of my hand, in slow circles.

"Dipper. How do you like that Dipper?" I ask him in a quiet, sexy voice.

"Ohh..." is all he says. I chuckle a little to myself and I move back to my bed before he wakes up.

"Goodnight my little Dipper..."

Dipper's POV

I suddenly wake up, sitting up in my bed. Why am I sweating?! I usually sweat a lot, by not during the night. Wait, was I just... dreaming about my sister? I faintly remember a feeling of euphoria while sleeping, and Mabel's voice saying... something. I look over to her bed and find her facing towards be, fast asleep. What was she doing? I ask myself, obviously not expecting an answer. I look down at myself and notice that my shirt is up high on my chest, and my boxers are a little loose. What?! I ignore all of this because I'm so tired, and I flop to my side and go back to sleep.

Mabel's POV

The next morning I get out of bed, rubbing my eyes, to see that Dipper was already up. I look at the clock.

"8:30? Wow, I slept in." I say aloud to no one. I give a big yawn, slip on my sweater of a dog dunking a basket ball, and head down stairs to fetch breakfast. When I get there, I see Dipper already eating, and when I walk into the kitchen, he looks briefly at me, and quickly goes back to eating, pretending he never saw me.

"Uh, hey Dip. What's up?" I casually ask him, fully aware of what took place the night before.

"Um, uh, y-yeah, good. I mean, I'm fine." he says in a croaky, nervous voice. He must have known what I did too. But I have to be sure. I need to probe him. I grab a bowl of cereal and sit down next to him with a thud, startling him into dropping his spoon into his bowl.

"Sooo..." I start saying in my cheeky smile face, "had any dreams last night?" He looks a little alarmed by the question and I see a spot of perspiration appear on his brow. "You alright there Dippy? You look a little hot."

"Uh, fine. Good. No, no dreams." He awkwardly says. We sit in silence while we both eat, and when he was finished, Dipper dropped his bowl in the sink and ran upstairs. I better go talk to him. I too rush upstairs and find him sitting on his bed with his head in a random book. Not his usual Journal.

"Dipper, about last night." I start to explain.

"What did you do?" he suddenly questions me.

"I didn't do anything! I just- remember last night you said that you were so alone?" I say in a calm, reassuring voice.

"Yeah," he says, "so what?"

"Well, I have a proposition for you."

"Oh no. Nothing good ever comes from you using big words."

"No, this one is good, trust me. I think you need a girlfriend, and I know the perfect gal."

"Really? Who?" Dipper asks. I wait a couple of seconds before laying it on him.

"Me!" I shout with a smile. Dipper pulls back a bit in dismay.

"What? Mabel, we're siblings. We can't do that. Besides, it's not like we could ever be-"

"Oh come on Dipper!" I blurt out. "I like you, and I know that you like me. I heard you talking in your sleep last night. We'd be perfect together, plus, we already know everything there is to know about each other so, we're already far ahead in the dating process."

"Wait, you did something to me while I was sleeping last night, didn't you?" Dipper asks while sternly staring me down. I crack under the pressure.

"Well... maybe. But hey! You liked it, didn't you?" I quickly say before Dipper can interrupt. He opens his mouth to reply, but just sits there, opening and closing his mouth like a fish. He suddenly stars blushing, obviously thinking back to his dream.

"Okay, fine, we can date." He says, "But, we keep it a secret. From everyone. Don't tell anyone! Not even Grunkle Stan. Deal?" He stares at me, waiting for a response. This is it Mabel. You did it, you got him to agree to dating! Let's make this fun.

"Deal."