I hope I uploaded it right. And thank you for looking into this.
I checked your save file.
You have not done much in the game yet. (More than 40% of the game)
The things I say are not just about your question about the game and in general, it is about how much progress you have made in playing the game. Some of the opportunities you have not started yet. And some are not finished.
Mentor: You haven't started Lisa foot massage yet. In fact, Lisa is still sleeping with her pants on and ...
School Mate: Not started yet.
Who does not take risks: not complete. Also, do not allow to be punished. Use (save / load).
Sticks and carrots: Not started yet.
Schoolgirl: Not complete.
Favorite aunt: Not complete.
And ...
And about your question:
To continue the process you want, you have to follow the process of "schoolgirl" and "mentor".
After talking to Kira about the kiss lesson, use the ladder twice while she is in the bath. And join her in the bathroom.What happens next depends on your sexual skils to deal with Kira in the bathroom, lounge and pool. There is a lot of content and not all of them can be described in one post.
Get help from the guide below and advance as far as you can in the game. If you encounter a problem, ask and we will help you.
Read the following sections:
"Schoolgirl","Mentor","School Mate","Sticks and carrots","Who doesn't take risks","Favorite aunt","Chirstina" And
<Event tab>
The first two and the event tab are important for your question.