There are scenes which is easy to understand the order like the one with the husband, where Juliana assumes that they already did a lot of things while MC don't know anything about it (MC is in the future) . But that threesome scene not sure if it was the present but it is obviously their very first sex , just read the dialog between heather and juliana while they are drinking , you will know that it is the first , Juliana's husband is out of town, she has needs but she is still reluctant to have sex with the MC and Heather is pushing her to do it then it happenedWhat he says is, that we haven't seen MC and Juliana's first vaginal scene at all.