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Ford had spent most of the day outdoors, scouring through the forest and surrounding area for anything new that he could document. He'd been quite excited to find a glowing purple fungus he didn't recognise growing on a cluster of rocks that looked as though they'd been arranged into a specific shape by unknown hands, and carefully scraped a sample into a glass jar for analysis later, before making a note of where the rocks could be found.
Unfortunately, it was now starting to get chilly and the gathering grey clouds made it clear that rain was on the way. He'd have to return to the lab. He could come back tomorrow, assuming the weather was better, and he'd bring Dipper with him.
He hurried home, making it back to the Mystery Shack just as the first drops of rain started falling. There was no sign of Stan, who had gone out to do who-knew-what, and Mabel, as far as Ford knew, was up in her room.
Dipper was in the living room, sprawled on his stomach on the fur rug, reading a book. He was wearing his usual attire of a t-shirt, windbreaker, and shorts, but the shorts were rather more revealing than usual, the fabric clinging tightly to his buttocks, accentuating the curves, and leaving most of his bare legs on display. Ford found himself staring at the exposed skin more than he should. Surely Dipper hadn't been wearing those earlier. Had he?
"Hey, Grunkle Ford," Dipper said casually. "Find anything interesting?"
Ford shook himself and coughed with embarrassment. "Er… Dipper…" he trailed off, unsure how to broach the subject. "I, er… think you might be outgrowing those shorts."
Dipper glanced up at him, with a slight smirk on his lips.
Ford cleared his throat, and tried again. "Do you have any others? Some larger ones, I mean. Because, if you don't, we should, erm… probably get you some. It's just that those are… they’re starting to look… rather… indecent."
"You mean they really show off my butt and legs?" Dipper replied in a low purring tone that Ford had never heard from him before. "Took you long enough to notice it, Grunkle Ford. I was beginning to think you were asexual or something." He sat upright and sprawled his legs open, giving Ford a direct view of his crotch covered by the tightly stretched fabric.
Ford's jaw dropped. "Dipper, a-a-are you… a-are you trying to seduce me?" he spluttered.
"Is it working?" Dipper purred. "Do the shorts do it for you, Grunkle? Hmmm? You like what you see?"
"Dipper, for heaven's sake, you're fourteen!"
"That's old enough," Dipper shrugged.
"No! No, it's not!" Ford protested. "I-I can't do this, Dipper!" He turned and fled, running for the safety of the downstairs lab.
Dipper's body rolled over on the rug, laughing uproariously to himself. "Oh, Fordsie, you liked it! You old pervert!"
Dipper's spirit floated helplessly in the air beside him. "You! You… monster, Bill! Give me back my body!"
"Come and take it!" Bill mocked him. He stood up and walked over to the incorporeal ghost. "Go ahead, Pinetree!" He casually flicked at Dipper's nose, although his fingers went right through instead of making contact. "I told you I had plans for old Sixer. How long do you think he can hold out for? I haven't even started yet!"
He made his next attempt in the evening, waiting until after dinner when Ford was relaxing and reading through some notes alone in the lab, while Stan was watching TV upstairs out of the way. Timing was everything.
Bill had changed back into a larger pair of Dipper's shorts, before slipping downstairs to the basement, he was smart enough to know that that same tactic wouldn't work twice. Ford would just ignore his advances a second time and tell 'Dipper' to go and get changed. He needed to begin his second more attempt more subtly before moving in for the kill.
Dipper floated along behind him, unable to stop him as he sidled up to Ford. The purple fungus sat in its jar, pulsing ominously, as Ford put his notes down on the desk at Bill's approach.
"Hey, Grunkle Ford. I'm sorry if I scared you earlier," Bill began, trying for a genuinely contrite tone.
"You didn't scare me, Dipper. You just… took me aback," Ford sighed. He removed his glasses and massaged his face, trying to get a handle on things. "That was extremely inappropriate, you know?"
"Was it really?" Bill said softly, trying to aim for the right balance of apologetic and persuasive. Sometimes it was useful to be a demon. "I've been in dangerous situations most kids my age have never been in. I help you fight monsters and aliens, I've risked my life to save yours. I'm old enough for all that, but I'm not old enough for sex?"
"It's not that simple, Dipper," Ford protested, putting his glasses back on. "Even if you personally are old enough at this age, the law says you aren't, and there's nothing either of us can do about that."
"So it's not that you don't want me?" Bill-as-Dipper confirmed. "You're just afraid of the consequences?"
I knew it, Sixer. You're a filthy old pervert who wants to get into this kid's pants, just needed a little nudge from me to make you realise it.
"I'm right to be afraid of the consequences, Dipper. Do you have any idea what could happen to me? Do you know anything about statutory rape laws? Anyway, you're my great-nephew and that's a whole separate can of worms."
"Don't tell anyone then," Bill purred. He slowly hoisted himself up into Ford's lap. "I promise I won't. Nothing bad can happen if nobody knows."
Ford's left hand rested unconsciously on Dipper's waist. As the boy nuzzled him, he began to stroke him in return, gently caressing the young body through the fabric of his shirt. Bill smiled to himself, his plan was working.
Dipper reacted with alarm, floating closer, cursing his lack of a physical presence.
His body leaned in closer to the old man. "Can I tell you what I want?" Bill-as-Dipper asked quietly, his breath soft and warm on Ford's ear.
Ford tensed up beneath him.
Dipper floated helplessly alongside. "Grunkle Ford! Don't listen to him! It's not me!" he pleaded into Ford's other ear. "I don't even think about you like that!"
Dipper's body smirked at him over Ford's shoulder. He can't hear you, Pinetree, Bill mouthed silently, and returned to nuzzling Ford with Dipper's face.
"I want those big, six-fingered hands on my bare skin," he breathed into Ford's ear in a low sensual tone. "I want your big thick cock inside me. I want you to hold me down by the hips while you thrust into me over and over. I wanna take it in my mouth and suck on it until I choke. I wanna sit on your lap with no pants on and be your cockwarmer while you write your notes."
"Jesus, Dipper! Where did you even learn words like that?" Ford protested.
"Off the internet," Bill-as-Dipper shrugged. He reached up and lightly traced Dipper's delicate fingers along the older man's strong jawline. "I've wanted it for so long, but I never thought you'd feel the same. It took you so long to even really notice my body. But you noticed it earlier, didn't you?"
He smirked deeply and leaned forward, moving in for a kiss…
"No!" Ford shouted and shoved him hard off of his lap onto the floor. "I'm not doing this! Jesus! This is… this is wrong! Go to your room, Dipper! Just go!"
Dipper's body picked itself up and slunk off up the stairs, doing Bill's best impression of a kicked puppy, anything to play on the old man's guilt. Dipper's spirit floated upstairs after him.
Bill locked the door of the attic room behind him, and sat down in front of the mirror to carefully peel away the brown contact lenses, revealing the glowing yellow eyes underneath.
Dipper still floated beside him, powerless to stop the monstrous demon from doing whatever he wanted with Dipper's body.
Bill turned and smirked at him. "Did you see that? He's cracking, Pinetree."
"Give me back my body!" Dipper raged impotently. "You… you stay away from Grunkle Ford!"
"Make me!" Bill mocked him.
Dipper flung himself at Bill in a rage, only to pass harmlessly through him.
Bill just laughed, Dipper's own voice cruelly mocking him. "You feel bad for him, Pinetree? Maybe you'll change your mind when you see him shove his big fat dick into what he genuinely thinks is you!"
"He isn't going to do that!" Dipper protested. "He doesn't want me in that way. Not really."
"Ooohhh, Pinetree, so naïve…" Bill mocked. He settled himself on Dipper's bed, and languorously stretched out his limbs, enjoying the sensation of having human muscles, before folding his arms smugly behind his head. "He'll give in before long. And when he does, I just need to make sure somebody catches him at it. Cameras as well, even the world's best lawyer can't argue with CCTV." He chuckled evilly at the ghost's helpless impotence. "Oh, Pinetree, with my brains and your body, we're going to get dear old Fordsie at least ten years in the slammer!"
Bill loved it when a plan came together, and right now his plan was coming together very nicely indeed. With Pinetree trapped in the ghost realm and Sixer locked up in human jail, who was going to stop him from taking over Gravity Falls?