Exploring Cas' unaware bod Your Own Shrinkray Adventure chapter 6 by dellobenedetto and Marak077

You decided to start climbing up Cas' body—this was what you were eager for, after all! Wasting no time, you clambered up the couch, racing to get right up close to her amazonian physique. Up close, her scale was nigh-incomprehensible. Her thighs stretched high above you, an impassable wall, and you could barely even see her bikini-clad butt between them and the back of the couch. Touching the skin briefly confirmed how delightfully soft it was, and urged an unconscious twitch of the leg from your enormous escort. Far, far above, her bust and head loomed over you, and from down here you could see a way into her crop top that would let you sneak into and explore her cleavage... that is, if you were daring enough to try climbing up there.

 She probably won't be mad if she finds out you've been peeping on her while tiny, but it'll be fun to see how long you can sneak around on her before she notices!

So, where would you be going first?