Explore the tapestry

There's no point wasting time--you need to get out of here. The only place there might be an exit is behind the large unicorn tapestry.

Sure enough, lifting the tapestry, you find a heavy wooden door that opens outward. However, after pushing for several minutes, you realize that it is locked via a rather odd-looking lock that is in the middle of the door about waist level. The key (or whatever) must be very large, because the opening is the size of your fist. Hanging from a hook next to the lock is a large, old-fashioned key.

Taking it, you look around. The chest you saw earlier has a lock that looks similar, and, sure enough, when you slip the key into the chest, it creaks open.

Inside the chest are another key and an odd-looking metal device.

Picking up the metal device, you see that it consists of a closable ring connected to a hinged, hollow cylinder. With a flash of insight, you realize that it looks about the shape of that odd keyhole in the door. Rushing over, you find that it indeed fits the hole perfectly, but the door still doesn't open. Rats.

Returning to the chest, you see that there is a picture drawn on top of the lid. One side shows a hidden keyhole in the right window of the room. You check and indeed there is just such a hole that fits the new key perfectly.

The second part of the drawing is more alarming. It shows what the odd metal object is. The ring fits around your balls and the sheath covers your cock. The diagram also shows a person thrusting his encased cock into the lock in the door to open it.