BWAHAHAHAHAHAHAHAHAHAHA! ..... LOL at the disclaimer on Page 21, especially when one considers the ages of the characters (both in original material as well as this fan work) - NOT YET AT THE AGE OF CONSENT IN JAPAN!
Nonetheless, Saya-chan could always aim for the "Saishoudoukin" solution, especially if after this, Kokonotsu has to "... take responsibility, right?"