Kitten peeing on pillows

Help! I've had my kitten for 2 months now, he is probably around 5 months old, and this is the 2nd time he has peed on a pillow. He has been to the vet and has all his shots and is healthy. He is neutered, we do have 1 other cat (she is about 10 years old, spayed female) that he adores. Why might he be doing this? And how might I deter this behavior?

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