Does Dipper act any differently?

Yes

Upon entering the bedroom, I can't help but stare dumbly at the site of Dipper. My shy twin, who not moments ago was freaking out about me taking my clothes off, is now sitting on his bed naked.
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Looking up from that journal he found, Dipper raises an eyebrow at me. "Gnomes made you that uncomfortable huh?"

"Wha?" I eloquently say as I try to understand the sight before me.

"They weirded you out so much you're wearing pajamas even though it's so hot." He says, casually gesturing to the pj's I wore.

"Oh. Um, Yeah! That's it." I ramble out, trying to cover up the fact I have no idea why Dipper would be so casual about nudity. Or why he's thinking I'm the weird one for wearing pj's.

Moving over in his bed, Dipper pats the sheets next to him. "Okay, get in. I'll keep the nightmares away."

I simply stare before nodding dumbly. Easier to go along with the weirdness, rather than ask questions that would probably have Dipper suspicious. Especially now that the supernatural has been proven to exist. Worse, he might find out about the notebook, and what I did.

Stuffing the notebook between my breasts, that I still can't believe I now have, I snuggle up to Dipper. Hiding my blush behind my hair as I rest my head against his chest. Slowly, I drift to sleep as I feel Dipper run a hand through my hair.