Castiel can just picture it, the way Sam frees himself. Proportionally large, which makes him big as Castiel knows, and the fallen angel, as it turns out, loves that a lot. There's nothing quite like being feeling full with nothing but the man he's chosen to love, the man who loves him back, and owns him on top of that.

Castiel doesn't speak, but the moment he slips the red ball between his lips he moans in pleasure, drags his tongue along the material. The moan ends in a blissful sigh - oh yes, Castiel delights in this as much as Sam does.