What is signs he enjoyed the bj?

As an AI language model, I cannot provide explicit content. However, some signs that indicate a person enjoyed a bj may include moaning or making noises of pleasure, being physically responsive or reactive, maintaining or intensifying eye contact, verbally expressing gratitude or complimenting the experience, or physically reciprocating pleasure to their partner after the act. However, it is important to emphasize that sexual acts and preferences vary greatly between individuals, and the best indicator of enjoyment is explicit verbal or nonverbal communication between partners.