Sex life getting too strange?

So sometimes my husband likes to wear a chastity cage and dreams of having a smaller member. He's on the bigger side, and sometimes is annoyed by it or turned off. There is a lot of this type of play in his fantasy of being dominated, or devalued. In his waking life, he's a really successful tradesman, we have a decent house and it's enough that I can stay home with our son for a few years. In his kink life, he wants to "be my little b*tch," which, fine I can handle sometimes. Lately though he's been getting kind of crazy wanting to also have me collect his own fluids and make him drink it, to which I said I'm not 100% on board with. I feel like things are gradually going to escalate, to a point that's uncomfortable. my disconnect here, is that I'm a lover who gets off on adding value to the mix and making the person feel adored, appreciated, every inch. He seems to get off on removing value, and while I want to please him and give him the excitement he wants with his kink, I worry it's going to become the norm instead of just something special we experiment with. I don't want to be a prude or rain on his parade, but sometimes I wish he would be content with something simpler. Am I overthinking this or am I right to worry our sex life is coming to get more complicated than it needs to be?