What are the common elements in hentai manga featuring blowjob and harem?

The common themes usually include fantasy settings, power struggles, and complex relationships among characters.

I'm not really sure. These are quite different and not typically related in any common way.

Hentai blowjob manga usually features themes related to raw sexual expression and the fulfillment of certain sexual fantasies. Keep in mind that this type of manga is considered adult-oriented and has specific audience preferences.

Often, it involves explicit sexual content and fantasy scenarios. But it's important to note that such content may not be appropriate or legal in many contexts.

Often, these types of manga might explore themes of forbidden love, power dynamics, and unexpected life changes. However, it's important to note that such content may have mature or inappropriate elements.

The common elements usually include specific character poses, expressions, and the use of certain props related to spanking.

Such manga often deal with themes of infidelity and forbidden desires. They may explore the consequences and emotions related to cheating.