since no one's answered this in almost a week, I figured I'd stop lurking and answer it. there
is a sort of ending, plus 3 more scenes not mentioned above (ignoring the scenes with the succubus). in addition to what DocRipper mentioned, there's a clothed missionary scene (building next to the half-naked cowgirl scene, you've probably already found it, it's right at the start) and a clothed doggy-style scene in some stranger's front yard lmao. other than the pee scene, they're all marked by cardboard or carpet on the floor.
as for the ending/other scenes, have you ever wondered why there's this whole stalking mechanic despite the fact that you can do pretty much everything by just walking up to her and talking with her? also, if you've been exploring a lot, have you ever wondered why there's this one street that you can't walk all the way down, despite being able to walk on both ends of the street?