Confused By Lactation Play

I recently found myself intrigued and aroused by the idea of lactation play with a partner. I've been dating someone for about six months who is also in their 30s, and we have an open relationship where we explore various fetishes together. When this particular kink surfaced, I felt like I was stepping into uncharted territory. Lactation isn't something that's commonly discussed or written about openly within our circle of friends. I'm trying to understand if there's a deeper psychological reason behind my interest in this specific area, or if it's simply an expression of intimacy and nurturing between partners. Have any of you explored this aspect of kink play? Is it normal for someone at my age and stage of life to feel drawn towards such niche interests? I'm curious about others' experiences and advice on how to approach this with a sense of openness and understanding.