How do i respond? 😂

How do you answer your bf when he asks "what's it feel like having a dick inside of you?" I mean I answered it as well as I could but didn't know how to describe it. (This isn't me asking you to be critical of him, so dont comment if youre going to be. Also isnt me being uncomfortable with him asking. We're both bi and very open about everything.) I'm jw how you guys would explain what it feels like.