rim jobs.

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Also, if this makes sense in your relationship dynamic, it might make it easier if you emphasize the mental aspects or headspace that it promotes. Instead of the physicality, perhaps focus on something sexy about it, like how even more than other sexual acts it conveys a sense of power imbalance (lol least sexy way of saying "it puts you both in your place" ever)... Or if you're not into the humiliation of it, perhaps it helps to approach it as a sign of devotion, like an "i love and honor every part of you, even this" kind of act, which makes it beautiful as well. Thinking about it that way leaves me begging for it.

You should of course not do anything that is a hard limit but since there's a little devil on your shoulder pushing you, perhaps this can make it easier if you do give it a shot!