You're not going to be a drag. Tell it the way you feel is necessary for your T to understand. You can also start slow, and keep it a bit less detailed for starters. You can say that you are having romantic and/or erotic/sexual feelings for your T, and take it from there depending on how you feel.

When I told my T, I was actually wanting to be explicit (partially to be properly understood). However, as soon as I had told him I had fantasies about intimacy with him, he started exploring what that meant to me etc, without asking (or even leaving much room for) details. But other Ts will be welcoming (in an appropriate and safe way).

Do you feel safe talking about these issues with your T? What kind of reaction are you anticipating?