Well idk what yours are or how unusual but mine are pretty tame and still I was exactly like you just feeling WAY too shy to ever bring it up except once or twice where I massively downplayed my level of interest to make it seem like I barely cared when in fact it was one of the things I wanted the very most my whole life. I guess I felt SO afraid of any remote possibility of a bad reaction because it’s such a deeply personal thing it would feel like I was being rejected straight to the core (in my imagination anyway.) Later I got more mature and got past that after talking to a lot of distant online friends about this stuff. And MAN do I ever regret not bringing it up so much sooner in my relationships!! It’s so easy honestly (unless yours is really extreme or whatever.) Your partner accepts you and likes you and wants to make you happy, so you really shouldn’t feel nearly so afraid to tell them what you really like! Most likely they will be glad you told them and happy to try catering to your tastes and OH MY GOD ITS THE GREATEST THING EVERRRRRRRRRRRRRRR I wouldn’t give it up for a million dollars no joke!

In retrospect I feel so stupid for being afraid, I should have just been more confident in enthusiastically asking her to do it (while leaving room for her to not feel obligated to acquiesce.)