It is difficult to interpret dreams without having many details about the individual dreamer. There are very few generalized statements that can be made about dreams, which is why dream books are unreliable. One universal symbol in dreams is water. Water refers to the unconscious mind but that universal symbol may be overridden by a personal symbol. That is why one cannot interpret a dream without knowing the details of the dreamer’s life. Water may mean peace and security and not be a symbol of the unconscious mind. It depends on the individual.
You asked about whether this dream could indicate sexual abuse. That is a difficult question to answer. The fact that these dreams are vivid, memorable, emotional and reoccurring is significant and notable. Reoccurring dreams are essentially attempting to send us a message that we have yet to grasp. Dreaming of the basement and a humanoid wolf may signify sexual abuse but not necessarily.
The fact is that without a professional, skilled in dream interpretation, you may never know what the dream means. What can be said with certainty is that the dream is significant because of its vividness, repetitiveness and its emotionality. I would recommend that you keep track of this type of dream, being certain to record each detail, especially the way you feel during the dream. More details may be revealed in future dreams. It’s best to record the details of dreams as soon as you awake. You may also want to consider consulting a therapist who specializes in dream interpretation for further assistance. Please take care.