Bill ignored him and reached out to touch the Big Dipper birthmark on Dipper’s forehead, both making a startled noise of pain when it felt like they’d been shocked as soon as contact was made.
“What the hell, Bill?!” Dipper demanded.
“Shut up, Pine Tree.” Bill snapped, more serious now and he moved over Dipper, straddling Dipper’s lap and holding Dipper’s hair back with one had and studying the birthmark, putting his fingers close to it with the other hand.
Dipper had no idea what was going on and his mind was saying ‘hey when someone is straddling you, you put your hands on their waist’, but he knew better than to do that because this was definitely NOT one of those situations. When there was another shock from Bill coming in contact with Dipper’s birthmark however, Dipper’s hands flung to Bill’s waist to steady him as he nearly fell back.
“Interesting,” Bill hummed.