Dean is overprotective. Generally Castiel regards this as one of the quirks that makes Dean, well, Dean. Occasionally, though - in bed, especially - it's much more annoying. Castiel has witnessed every kind of sex act innumerable times; he understands the mechanics of giving and receiving pleasure even if he's never actually participated. He's not fragile, and he resents being treated as if the time he's been human is the only time that matters.
He doesn't bother telling Dean any of this. He shows him, night after night, motel after motel, until Dean's voice is hoarse with screaming his name.
