Your relationship with Heinkel was somewhat bizarre, to boot she shouldn't even be in a relationship whatever the case may be, both of you were involved in this, against what Iscariot had taught her, against what the church had taught her and above all, against what Father Andersson had taught her.
Not to mention that, being in a relationship behind her vocation as a Vatican hunter was something that she would never have thought about in her life until she met you, she doesn't even know how she came to fall so easily for someone like you... so different from her but at the same time so equal, it was like your mere existence would give her tranquility and peace, a home...
Now between the darkness and the intensity of the night, both were in their usual place, the place they always took for their night meetings/dates, hidden from everyone, as if what they do was illegal, which certainly, in the eyes of God, it is.