People come to this blog because they are having feelings or experiences that are often met with prejudice elsewhere, or they know someone who is having such feelings or experiences. If you're not sure your partner(s) would accept your feelings or fantasies, the information below might help. Maybe you can show this to them and see if they'll agree to discussions.
Clinical psychologist David J. Ley, Ph.D. wrote something very helpful at psychologytoday.com titled "3 Ways to Meet Your Partner’s Sexual Ideals and Why You Should"...
Viewing your partner’s sexual ideals and needs as important and valuable protects and enhances your relationship. Even if you can’t meet your partners’ sexual ideals, sexual communion mitigates the degree to which that mismatch negatively impacts your relationship.
Ley goes on to describe how to start to use this. Although Ley is writing about partners, this also might be helpful for people who are not yet partners, such as if there is someone who is in your life as a family member or friend but you want to add a sexual bond to your relationship.
Nonjudgmental Listening. The best, first, and most important way that partners can express sexual communion with each other is by communicating about their sexual likes and dislikes, in a manner that involves respect and acceptance. Acknowledging and valuing your partners’ sexual preferences is a critical and meaningful way to let them feel valued and accepted as a person, within your relationship. Have a conversation (actually, it’s best to have lots of little conversations as opposed to just one big one) with your partner about their sexual needs and experiences. Try to make them feel like you are interested and curious about their sexuality. Believe it or not, this is as valuable in long-term relationships with decades of history as it is in fresher relationships. Most people never tell anyone, even their life partners, about their sexual fantasies and interests, for fear of rejection and judgment.
Emphasis mine. Listening is so important. Getting your partner(s) to open up and share with you is the way to grow and deepen the relationship.