Powerful because of it's thrusting skills? Is it like permanently hard or something?

[They cannot imagine what a gigantic dick on a chariot can do. But then again, they can, and well. For how innocent Caelus comes off as, they... Certainly aren't.

There's some rustling, and before you know it, there's a knock on the door.]

Open up and show me this thing. We'll go outside so we don't traumatize your roommate.