Thank you for sharing this and from how you describe the encounter it's completely consensual. I'm so happy that it reawakened your sexual spark. That in itself is a wonderful outcome. Still, I must say that it's not the norm or IMHO professional for a photographer to have sex with a model during a photoshoot. As someone who dabbles in erotic photography, I explicitly set boundaries and ask for the model's boundaries. It's always best to over- communicate than not.