The idea of "scratch my itch and I scratch yours" tell me that you are categorizing oral sex in the category of exchanged favors which is a totally different thing from altruistic acts and care you claimed in your previous comment.

That puts the act of oral sex a reward for receiving oral sex. Sex as a reward is not healthy. But it's healthier than one side altruisticly offering sex anytime their partner wants.

Having sex when your partner is unwilling due to a obligation to make them happy is the definition of not having boundaries.

It's emotional weariness. Oral sex can be easy on the body but providing such intimacy when you don't want everytime your partner wants it is a major emotional wear. If someone becomes resentful after that and you think you are better of without them. They are also better of without you. Clearly you are not compatible.

Care is a finicky word. I understood it as "taking care of someone, to care for them" rather than " caring for their feelings" because of the altruism talks.

Improving communications is a lifelong commitment. That's just wrong to think it's a skill you learn and be done with it. You and your partner change daily. New experiences, forgotten ones, biological changes, even dreams. How to listen and talk is one method. How do they act when they feel emotions ? how do they react when you are having a bad day ? How do you react when you are not satisfied with their reaction to some news?

These awareness cost emotional effort. Their return is often being aware of your partners daily changes. While you can absolutely do sexuals favors in hopes of returning sexual favors, learning how to set them for more satisfying sexual adventures would probably be more healthy for your long term relationship.

You said you are ok with serving... You are providing sexual pleasure when you are not desiring it yourself. You are just serving sex dude. It is what it is. You are just acting like a masturbation vending machine at that point. Unless you are into it as well, it's just masturbation with extra steps.

Companionship has a basic rule that says both sides are equal in the social contract. You are not a companion if you are serving someone. You are a servant. A dynamic that routinely puts you in the position of a servant, is not a healthy one.