Sadde arrives in the middle of the night as expected and whiles away the time until Terel is awake. In the morning they catch up, and "catch up," and then Sadde calls Nils and her mer friend (whose name she never caught), and then she spends pretty much the whole weekend with Terel, between working on a shiny report for the appointment on Monday and, ah, "catching up." She visits the fair folk forest at night while Terel is asleep, and has an overall very relaxing weekend.
At some point between Sunday evening and Monday morning she decides she's not feeling like a 'she' anymore and switches.
And then it's Monday.