Dippers POV:
It was a nice day and Dipper was reading a new book from the library since he still hadn't gotten his book back from Stan it had been 6 years me and my sister are 18.
“Dipper look at what I found!” Mabel yelled grabbing me by the arm and out the door into the woods.
“W-where are we going?” I asked as we ran for what felt like hours.
Suddenly Mabel stopped by a cave and went in. I followed slowly, because the roof was covered in spikes and the floor would light up wherever you stepped.
“Hurry up!” Mabel whined as I picked up the pace a little.
“Where are going?” I repeated. At that, Mabel looked back at me with a ice cold glare that made me shut up only she can do that to a 18 year olds and not get punched.
Soon the only light came from the floor, which still made me stop sometimes. After a few hours I started to panic.
“Hey Mabel…?” There was no reply. I stopped, the light from ahead was gone. Mabel wasn't there.
”Mabel?” I ran before suddenly hitting something that sent me falling into a pit.
“Dipper?” Mabel’s angry voice rang out from beneath me.
“Y-yes?” I asked trying not to have Mabel kill me I still needed to stay alive for 3 years 21 at least for that.
“Get off!” she yelled. I got off as soon as she said it.
“Sorry” I said with my cute face on which she, to my surprise, kissed.
Soon we were out and before I knew it a sudden light made me blind. After wiping my sore eyes for a minute I could finally see.
“Hey handsome” I heard Mabel say to me.
“Mabel?” At that I saw a cute pink pegasus with a curly brown mane she gasped and blushed.
“Dipper...I thought you were someone else!!” I looked in the pool. I was a blue unicorn with a brown hair short hair. I saw my hat and put it on happy 6 years with this old blue hat.
“Ok…so where are we?” I asked with a reply of a shrug from my sister.
“I do not know...” At that a purple unicorn came to the clearing with 5 other ponies.
“Ohh new ponies!” the pink one said as she jumped on me. I thought she was killing me so I kicked in reflex which Mabel did the same since she was 15.
“H-hey no one hurts Pinkie!” At that a rainbow mare tackled me into the water and held my face under the surface. I kicked as I ran out of air I heard Mabel shout.
“Stop that you’re killing him!!”
I started to black out as I heard the rainbow pony say,
“Use your magic or I kill you” At that everything went dark.
***
I woke to find Mabel and everyone looking over me.
“Come on it’s ok you can breathe now” I heard Mabel cry I got up taking big gasps.
“Are you ok i’m sorry, I'm sorry I'm sorry, I'm sorry…!” the rainbow one said again and again.
“I-it’s ok” I said as I started to get a headache.
“Yea but if he had died, I would kill you” Mabel said with rage filled eyes towards the rainbow one.
“Ok love you.” I said playing along.
“Hey as a ‘i'm sorry’ gift, you can come to a party at my house at 6:00pm only 18+.”
“Ok we will be there.” I said with a big grin.
“Also my name is Twilight, this is Pinkie, Applejack, Fluttershy and the one who almost drowned you, Rainbow dash” Twilight said pointing to everyone as she said their names.
“Dipper, can we stay here until the party?” Mabel said with a cute face which made me want to kiss her face.
“No, what will Stan say we are 18 now he will be worried!?” I asked. If he knew, he would came and cause trouble and on and on.
“Him? I told him we were going to Candy’s for a slumber party” she said with a smile, which made all of us shiver.
“Ok,...I guess but slumber parties are for little kids” At that Mabel hugged me and whispered in my ear “I would kill you for that comment but You do look cute when you smile like that” At that she let me go.
“Ok so you can come to my house until then.” Twilight said, which made me look down and think about what Mabel said.
*******************
After a few hours, we were there at Rainbow’s house. Rainbow was waiting with 2,000 wooden containers.
“So what game should we play first?” she asked, which made me look at Twilight.
“Ooh ooh how about a I dare you?!” Pinkie said with a smile.
“Ok so I will go first! So Dipper I dare you to drink a barrel of cider.” Everyone gasped at how large they were.
“You’re on!” I said putting my mouth to the tap and turning it on. A sweet liquid filled my mouth. I swallowed it more and came to my disappointment as soon it was empty. I looked up as everyone gasped.
“I dare you to kiss me” I said with a smile toward Mabel.
“No, no you don’t get it, it has to do with cider!”
I gasped “Isn't that an alcoholic drink?”
Rainbow faced hoof. “Well duh” At that I had my first alcoholic drink I felt a bit funny but deep down but I knew there was no going back.
“Ok I dare you to drink a cup of cider off Mabel’s chest.” Mabel blushed as Twilight giggled.
“Fine.” Mabel sat down with her front hooves up as Twilight poured the brown liquid as Rainbow licked it.
“Ha ha ha stop it tickles!” Mabel gasped for air until it was over.
“I dare Mabel to drink cider from Twilight’s belly button!” Mabel nodded.
Twilight lay down as Pinkie put cider in her button wich Mabel drank in one go.
“Mmm” Mabel said as she looked up at Fluttershy “I dare Dipper and Rainbow to drink ten barrels in a race” Fluttershy fainted.
“A race... IT. IS. ON” Rainbow and I said at the sametime.
Twilight got the flag ready as I sat down and did something which made everyone look away, I vomited.
“Are you ok?” Twilight and Mabel asked as I got up and walked to the first tap.
“Ok? on your mark…” Rainbow and I put our mouths to the tap “Get set…” Mabel started to shake along with Fluttershy “...Go!” Twilight said as we started to drink. After the first barrel, me and Rainbow were tied. For the next, it stayed a draw until the fifth barrel. Rainbow slowed down a little but I didn't. I sped up, the sweet liquid was too good! By the time I was on my tenth Rainbow was on her ninth. I stopped and yelled.
“Done!” Rainbow stopped and started to swear.
“Way to go bro!” Mabel said.
Everything continued until the cider was gone and it was time to go. I got a trophy it said no1# Drinker, but I gave it to Rainbow. No one could hardly walk but me I fell every two steps Mabel in the end had to lean on me.
“Dipper we are going to spend the night at Twilight’s.” She said as I fell.
“Why? Isn't it rude to the...Twilight?” I said, finally able to keep balance.
“Y-you’re drunk...”
I replied the first thing I could think of.“Well you’re sexy!”
She looked at me with a smile and said.
“I know but so are you!” she said with a hint of playfulness.
“Aren't you two twins?” Twilight asked, looking at us, concerned on what we might do in bed that night.
“No..I don’t think...the pine trees...” Was my reply. I tried to keep on one thought but that turned to another in seconds.
“...Ok are you colt and mare friends?” Twilight asked.
“Duh!” Mabel said as Twilight turned away and looked at me and whispered “What does that mean?” I looked up.
“Something to do with sex, I guess.” At that, Mabel kissed my cheek.
Soon we were in a bed, Mabel kissed my cheek again and sat on me before saying “Stay here.”
Mabel POV
I went to go get Twilight.
“Hey Twilight, I want your help.” I said as Twilight trotted up to me.
“Yea?” she asked, looking at my eyes.
“First of all, am I drunk? Second, I want to do something but I need you and Dipper.”
“Yes very, but Dipper is more drunk that you, Second ok what with?”
“Follow me.” I said, going into the bedroom.
“Hey Mabel, what is going to happen?” I looked at Dipper with a shut up look.
“Twilight, never mind you can go...” she gave me a confused look but left.
“So Mabel, what now?” I jumped in bed. Dipper smiled. Oh but it wasn't over yet. I kissed Dipper in the mouth which made him surprised.
“There you got that kiss you wanted.” he looked happy. I hugged him.
“I love you.” He said which made me smile. It suddenly hit me then that this was my drunk brother.
Dipper POV
Mabel was acting weird but I thought I might as well play along. I kissed her, which made her shocked but she closed her eyes. Soon I was lying on her, and started to lick down her stomach which made her gasp.
“G-go faster.” she said but I didn't. I was going to make her wait like a dog.
When I slowed down, Mabel wiggled a bit which made me go in zigzags which caused her to wiggle a lot.
After a minute of licking her stomach, I went lower. I was curious about what was next, it was like a folded piece of paper. I put my tongue in it which made Mabel gasp and wiggle a bit more. I licked back and forth. Soon it got wet with the second sweet liquid of the night. It tasted of sugar lollies and I could swear I could taste a hint of pine sap. I dug deeper for more of the sweet liquid. Soon I was as deep as I could go. Mabel keeped gasping that if anything made me go deeper, do it faster. I pulled out which made Mabel put on a sad face before going in fast which made Mabel gasp hard. I did this in, out, in, out until she started continued to gasp in pleasure. I continued when suddenly Mabel let out a scream as a wave of the liquid went on my face. I cleaned it up as Mabel panted. Mabel, after a few seconds told me to lie down. I did as she put her face by my penis and started to lick it. I gasped in the pressure as she continued, the pressure increased.
She then put her whole mouth over it and sucked. It was soft at first but became hard the pleasure continued until I reached my limit in one more thrust I shoved it as far down Mabel’s throat as I could before cuming. It was a nice feeling as I emptied my self in Mabel. After a few seconds I hugged her. She jumped on top of me and this time put my penis in her vigina and started to pull it in and out soon I found myself following her lead. I swapped sides with Mabel so that I was on top she didn't care as long as I continued. This continued for a few minutes the same feeling came to me I increased my speed with Mabel gasping all the way. I was on the edge when I went full force into her as I kissed her mouth she screamed in pleasure while kissing me. It was cool as I cumed, she did as well. The liquids mixed, it felt amazing but with a high came the low. I was exhausted and so was Mabel so I pulled out of her and kissed her before going to sleep.
*****************
I woke to Mabel shaking me awake. My head hurt and my body yelled at me.I looked at Mabel.
“W-what?” I looked down as everything came to me.
“We...I...you…” I cut her off with a kiss. She smiled and in a few minutes we had cleaned up the mess we made as Twilight entered with a angry face on.
“How old are you two?” She asked as a brown pony with a familiar hat entered.
“Eighteen...” She was shocked.
“How much cider did you two have?” the brown pony said. I looked at Mabel.
“Who are you?” I asked just to make sure it was Grunkle Stan.
“Stan Pines, now how much?” Mabel and I crouched down low.
“1,000 barrels...” I said looking down with a smile.
“200” Mabel added ears going down.
“1,000 barrels!?” he said, shocked, looking at me,.
“Yes.” I got up, ready for any punishment.
“Ok well it’s time to go and what is that smell?” he asked looking at the bedding on the floor.
“We...fucked each other” Mabel said, coming clean.
“WHAT?” Stan said in shock.
“Ya it was fun.” I couldn't help but say in a cheery voice.
Stan ran downstairs and we followed only to see him vomit out the window.
********
After a few hours we were at home as humans but Mabel was still cute.
“Hey dorks, what happened? Stan is acting weird.” Wendy asked, looking at me. I was about to tell her I had a crush on her for 6 years but Mabel said
“I fucked Dipper.” Wendys face dropped.
“we were drunk!” I added trying not to look bad.
“You got drunk?” Wendy asked looking at the door Stan went through.
“Ya Dipper’s like the drinking king” Mabel said with a high pitch note at the end.
“How much did you drink?” she asked as I went through the door. I answered.
“1,000 barrels.” Wendy was in shock but I was already half way up the stairs to care much.
