Dimentio's Secret Journal
It was another failure in stopping the chosen heroes of the Light Prognosticus, however, Dimentio was confident that his own plans will work. They were all distracted and focusing on their own tasks, and Count Bleck has his sights set on the heroes. He grins and chuckles to himself, soon, he will overthrow the Count while his guard's down and then, he will create his own Perfect World.
Yes, it was all going to- "Dimmy!" *sighs* dammit. There was that annoying shapeshifter girl again. The jester smiled as Mimi arrived as he was floating down the halls, minding his own business. "And to what do I owe you now, Mimikins? I haven't took your diary." Dimentio said and mentally chuckles. Again. "Oh, no. But I did find something interesting!" Mimi said with a giggle.
"Oh really? And pray tell, what is it?" Probably some stupid cute thing or some shiny gem she found. You know, Mimi things. The green girl warped away and warped back and Dimentio's smile immediately vanished once he saw a dark purple book. "Ta-dah! Your own diary!" Dimentio's eye twitched at that.
"It's not a diary, it's a jour-I mean. I've never seen it before. You can just put it back where you found it." The jester said, and cursed himself for that slip up. "But it has your handwriting and everything. You're actually kinda a dork." The interdimensional jester's cheeks flushed at that. "Sh-shut up! Give me that book!" He reached to grab it, only to faceplant onto the floor as Mimi read a page.
"Today I went to Great Tree and faced off against man with a bushy moustache, a beautiful princess, and uh, some turtle thing with dinosaur arms. I screwed up and didn't think that Dimension D enhanced the oppenents abilities as well. Oops. But I played it off like it was planned. Grambi, I'm so smart!" She read while Dimentio blushes in complete embarrassment and groans.
"Aww, you even included a smiley face at the end!~ Cute~" Mimi gushes and teases the flustered male. "Oh... screw off! Are you done mocking me now? Can I have that back?" He stood up as Mimi gave him the journal back. "That's okay, you can have it." He was quite relieved, until he heard: "I've read all of it."
Dimentio was frozen like a statue as he just realized she knew all of his secrets. Including his, erm, dorky side. "Not so fun on the other end, is it Dimmy? Tee, hee, hee~" Great, if word got out, his reputation would be ruined. So, this is what it's like to be the victim. He didn't like it. He sighs and buries his face into the journal before looking at Mimi. 
"Wonderful... I am caught like a wild animal scrounging for food, only to step in a bear trap. What do you want?" He said, there was no way of escaping this. Well, besides murder. But Count Bleck and Nastasia didn't like their own minions murdered. Grambi damn it. "Since you took my diary so many times like a dummy, you'll have to do what I say, or I'll tell Nassy and the Count all of your secrets! Including your fetish for-"
Dimentio flustered even more and cut her off. "Fine!" He grits his teeth and stares at the shapeshifter who had a shit eating grin on her face. "What. Do. You. Want?" Mimi thought about it and giggles. Oh, that was already a bad sign. He was led inside Mimi's room and right from the get-go, she opened a closet and all sorts of outfits could be seen.
"... No. Absolutely not. I will not be a... a model in your twisted fashion show for the demented!" He crosses his arms, as he realized he was basically throwing a temper tantrum like a child. "I think I have the fetish page right here. Page twenty-" Mimi began to read it before Dimentio sighed. "Why me...? What do you want me to wear?"
Mimi pointed to an outfit as the jester grumbled under his breath. Dimentio enters the spacious closet and get's the one Mimi chose for him. And of course, she wanted him to wear the completer outfit. He took off his hat, poncho and his shirt and pants. He grumbles some more and puts the clothes on himself. All of it.
Once he stepped out, he was blushing and lowered his gaze to the floor. "There. Is this what you wanted, Mimi?" Dimentio said, Mimi looked at him up and down. He was wearing one of Mimi's old dresses, a yellow dress with flower patterns on it and that it only came to his knees. Without his jester outfit, he was actually quite slim.
Makes sense since he relied on his magic to do everything for him and floating around. "You look like the cutest girl in the castle, Dimmy!~" Mimi teases him. "Mmph. I'm done. Can I leave now?" Surely, this would be enough? "Uh, uh, uh. I want to see if you were committed to wearing the whole package. Lift up the dress." Mimi said.
Dimentio did as he was ordered too and lifted the dress, he was even wearing some panties that were a bit snug as his crotch was confined. "You are a perverted, sick girl, Mimi... Even more demented than me. And that is saying something. Can I please leave? This is embarrassing..." He hated sounding so... vulnerable. He was supposed to be strong, fearless and in control!
How the fuck did this even happen? For that matter, how the Underwhere did Mimi even find his journal? Unlike the dumb, carefree girl, he hid it well, even changing hiding spots just in case. He would have to rectify this later. 
Mimi giggles and put her hand inside his panties, making Dimentio gasp and shudder in surprise. "M-Mimi?! Wh-what are you-aaah... ah... n-no..." She was fondling his crotch and found his erection. "Oh, what's this? Getting hard, Dimmy?~" Mimi said and gave him a naughty expression.
"Mmh... n-no... n-nonsense... Why would I enjoy dressing up like a woman...? It's absurd!" But deep down, he loved this. It was such a guilty pleasure, after all, he did write down one of his fetishes in his journal. The green pigtailed girl stopped and led Dimentio to her bed and pushed him on it.
She climbed on top of the bed and took off Dimentio's dress, exposing him with a bra he put on along with the panties. He did look very feminine without his jester's outfit. Probably to hide it by wearing something big and poofy. Dimentio hastily covered his chest and crotch with his hands, but it was useless, Mimi saw it all.
"M-Mimi... I... I won't steal your diary anymore! I won't even bother you! Please... I... this is..." For the first time in his entire life, he was afraid. He hated that emotion. Fear and being helpless. He could just teleport away, but Mimi had the same ability too. He was truly stuck. The girl giggles and had something planned. "Relax, Dimmy. I know a way we can both enjoy this~"
What the Underwhere was this psycho girl blabbing on about now?! A puff of smoke and Dimentio's eyes widened at who he saw in front of him. It was himself. Mimi had transformed into Dimentio. It was perfect. "Ah ha ha ha ha~ And so I transform, like a jester performing for the royal king! Or something like that." Mimi said in Dimentio's voice and fake laugh he did.
He felt so humiliated, was that how he sounded? Dear Grambi, he sounded like a complete loony. "Now then... let's move these out of the way first." Mimi moved Dimentio's panties aside, exposing his balls and dick, along with his asshole. "M-Mimi...?" Dimentio whimpered, he then saw Mimi lowering her pants and showing off her own erection and aimed it at the jester's entrance.
"I've always wondered what it would feel like... Get ready Dimentio!~" Mimi said and held the male's wrists and thrusts inside. Dimentio's eyes widened and screams, while his body spasms from the alien feeling. "AAAHHH!!! FUCK! Take it out! Take it out!!! It hurts!" Mimi lifts him and places the jester on her lap, and started to kiss him.
Dimentio whimpers and wraps his arms around the transformed Mimi. It felt so strange kissing himself, or rather, a person posing as himself. He felt Mimi slowly thrusting inside him as the feminine boy closes his eyes. "Mmh... mmhf! Nnhf..." 
Mimi groans and held Dimentio's waist. "Oh Grambi... it feels so nice and tight...~ I guess I shouldn't be surprised you're a virgin, huh? Being a boy is awesome!~" Grambi, it felt so weird hearing his own voice say that. As the kissing went on and Dimentio felt his anus being fucked, the pain started to slowly go away and he blushes.
He was starting to feel good. And that also scares him. Mimi still transformed as Dimentio, rubbed the real Dimentio's back and used her tongue, the jester followed her lead and started Frenching each other. Dimentio couldn't contain his girlish moans any longer, and his cock was twitching from pleasure coursing through his body now.
Mimi pulls away as she heard him gasping and grunting as he moved his own hips in time with the shapeshifter's thrusts. "I bet it feels good, huh, Dimmy? To be fucked by yourself?" Mimi said and moans out. "HHah... ahh... y-yes... I... I admit it... I love this...~ Oh my Grambi...!" Dimentio groans out and rested his head on Mimi's shoulder, he didn't hide his excitement and didn't care if he sounded like a needy whore.
This was simply wonderful~ "Mmhf... I'm getting close. Want me to cum inside you?" She whispered, making the horny boy shudder. "Y-yes... I-inside... annh...~ H-hurry...!" Precum began leaking out and went inside Dimentio, he squeezes his eyes shut and moans loudly as Mimi came inside him, filling him up with cum.
The feminine jester's body shudders and his cheeks blushed. He was then pinned down on the bed as Mimi thrusts some more, giving him no time to rest or process what just happened. "AAhn!~ M-Mimi!~ Mimi!!~" He cried out and his eyes rolls back, Mimi chuckles and enjoys seeing his expression of pure lust and pleasure.
"You're just a horny femboy aren't you?~" Mimi teases him, and hits his sweet spot, making him moan like a girl. "Aaahn!~ Yes!~ I'm such a femboy slut! I love being dominated! Plus, fuck me and wreck my boy pussy! I need more cum and dicks inside!~" He giggles stupidly as hearts appeared in his eyes.
It seems he was on the verge of breaking, which suits the shapeshifter fine. She held his hips and goes deeper and harder, giving Dimentio the fuck of his entire life. The jester gripped onto the sheets and stares at Mimi with a loving and lustful gaze. "Aaaah! Please cum in me! I NEED IT SO MUCH!!!~"
Mimi grits her teeth and slams deep inside Dimentio and fills him up some more, his stomach actually bulged a little from the load. "Aahh... ahh... M-Mimi...~" Mimi pulls out and sprays the last of her load on Dimentio's chest and face, who seemed really happy. She transforms back into her normal form and giggles, seeing the once confident jester fucked silly.
"Well, that was fun~ You can go now. I'm done blackmailing you." Mimi said, Dimentio snapped out of his afterglow, the cum leaking out of his abused ass and staining the sheets. "H-huh? W-wait..." This can't be over now, it felt so good for him! "C-can't we do more...?" He said and bits his lip.
"Hm?" Mimi was getting interested in seeing this new side of him. Dimentio stretches his asshole with his fingers and more of Mimi's cum leaked out. "I want more... I love you Mimikins...~ Please... don't toss me away..." It almost sounded like he was actually about to cry. Mimi smiles and kisses his cheek.
"Don't you worry dummyhead~ We can do some more naughty stuff together~" Dimentio smiles at that and from that point on, his life and his goals completely changed. He couldn't even remember what he wanted to do originally. Probably not important. "I'll be yours forever, Mimi~"
END