...Sometimes I Struggle...

I've been with my partner for five years now, but there's this one thing that's always felt like a chasm between us. Lately, I've found myself drawn to a particular kink, something involving roleplay and submission. It's something I rarely talk about, even though we're open about many things in our relationship. Last night, as we cuddled after making love, I couldn't help but wonder what it would be like if he was my trainer... or something more controlling. The thought of him directing me, pushing me to my limits physically and mentally... It scares me a little, but also thrills me. How do I bring this up without scaring him off? ...I just wish we could explore together...