Welcome @BiGuy37. Glad to have you here! I totally understand your hesitation in sharing that kinkier side of you with your partner. Especially if you have been with that partner for many years now. Let me preface this with: in no way am I a licensed (or unlicensed) marriage/couples counselor.
When it comes to relationships, they always say that communication is key and that is very true. You should be with a partner whom you are comfortable enough with to open up to and express your desires without judgement. Obviously, there are limits to this, right? Limits which I will not get into at the moment.
My point is, we deserve to be with a partner who complements us and is willing to entertain our needs, even if those needs extend into the bedroom and belong into the realm of a kink. If we are not free to express those needs, then we build up resentment towards our partner and will continue to feel the shame of what we were afraid to share at a deeper level and that would definitely spill over into the rest of the relationship potentially causing unnecessary tensions.
I am sure that this may not be the response you were expecting but we are all here to support you and your cum consuming desires. You are not alone! 😀
Again, welcome and I look forward to hearing more from you.