The sessions I remember most are ones that Mistress took complete charge of, and they develop in a way that she wants. They usually start out with me in something cute and girlie. She will lay out a pair of extra pretty panties or a thong in the morning or after a shower. It's a hint that something fun is on her mind. We have a sconce in the bathroom; if a pair of panties or a thong are draped over it I know to prepare myself. Giving my wife a massage or foot rub is frequently mixed in there as well.
I don't always get unlocked, but she does like to play with her boi parts, so I'm often unlocked, but I can not ask to be. It's always her decision. During one memorable session I was secured to a stool with plastic wrap, naked except for a thong. When she was pleased that I could not get free, she put on her strapon and said, "time to get on with the fucking!" I was shocked, she never uses that word. Probably why I haven't forgotten it, and also what followed.
That stool has become a favorite of hers, lots of fond memories associated with it.