Depends on what variation of the trope we're going with. I've seen a few takes in which the victim feels nothing from beginning to end and leaves completely clueless of what's been done to them (or what's been left in them), so this could easily be a take on that kind of trap.
I've been saying it since the beginning, but this goddess is the worst. As if changing it on the fly wasn't bad enough, using up everything he worked for so far?! Resetting it all back to 0?!
As cute as this is... am I the only one who, the longer this goes on for, the more I feel bad for the dude as he simply gets used to fuel her fetish? Yes, he's getting decent tutoring, but he shouldn't have to go through this for that.
... if it's the middle of the night in the church, how did he not hear the three of them sneak in and huddle right outside the booth? If the booth has magic to make what's outside be unheard inside... why not the other way around?