Answer:
I saw a strange creature. Long, hard, and straight, thrusting into a round, dark opening. Preparing to discharge its load of lives. Puffing and squealing noises accompanied it, then a final screech as it slowed and stopped.
A hole leading in, a hole leading out, we connect to a cavern that is slimy all throughout. What are we?
What is full of holes, but can still hold a lot of water?
They can float and tickle, but their sound is rarely heard unless you're a pillow or bird. What are they?
They belong to me; they belong to you; They can make you feel happy or make you feel blue; They never end until the day you do.
What never gets any wetter no matter how hard it rains?