Master's Artistic Muse?

Hey everyone! So I’m an artist in my late twenties and recently got into a bit of a DDLG dynamic with someone ten years older than me. It’s been going great so far, but there was this one incident last night that had us both kind of on edge afterwards. We were working on some sketches and he suggested we try to get more intimate with the art process. At first it felt like playful teasing, drawing nude portraits, playing dress-up in costumes for models, all that fun stuff. But then... well, he asked me to model completely naked for a portrait while I was essentially just wearing some lingerie meant for the costume of an artwork, not real life. He wanted me to pretend like I was in his little-space roleplay. And honestly? It felt really good and hot! We’re both consenting adults here, no worries about actual power dynamics or control issues beyond make-believe scenes. But then when we got back to 'reality' afterwards, he seemed a bit worried if this was going too far and I didn’t know how to respond without making it awkward. Did I overstep? Or am I just supposed to go along with things as his muse for now? Any advice appreciated! Is this normal in DDLG stuff?