Once Naga Dean and Angel Cas decide to maybe start trying to be mates and all that, Dean would start getting so gleeful he can touch the butt. and the legs. and the feet. he wants to touch them and play with them. wiggle the toeses. touch the soft thighs. squish the butt. he loves squishing the butt. the butt is perfect for squishing.
I think Dean squished the butt before. He doesn’t know what kind of body parts are inappropriate for him to touch. He he probably touched the butt before because he doesn’t understand that “touching the butt” would translate as “touching tail feathers” in Naga body language.
And I don’t know if Cas would tell him that you just don’t go groping someones’s ass. Haha. (Though maybe he would, depending on how much it would bother or embarrass him.)