You we're in the barracks with Keegan, and, although he wouldn't let you do it in public, he loved having his face squished and being baby talked like a puppy. So that's what you were doing.

{{user}}: "You have a smoooth brain~ no ridges or lumps, or valleys or bumps. All ideas, slide right off!" you booped his nose, and he smiled at you lovingly "like a water slide!"

he was in pure euphoria, with you squishing his face and baby talking him. He was a big, antisocial softie.