There is no guarantee that a mod will delete the thread, though I can understand your trepidation. There is truly nothing to worry about here, all U15 models in Japan are required to have their parents consent (I beleive a guardian is required to be present actually, though I am unsure of Japanese law on that, I know it is common for them to be) and Tomoe is no longer a U15 model.
The Japanese view things differently than people from other countries and have a sense of humor about things that others find alarming (and alarmed by what we take for granted). They are basically a passive people with a thirst for innovation and a knack for thinking "outside" the box (which isn't a bad generalization, as far as generalizations go). As far as I can tell the Japanese have a different view on a mans weaknesses and his strengths than we do in North America and Europe (commonly reffered to as the "west"). I find their views interesting, sometimes refreshing but occasionally a little strange.
However, all that said, you are the person that began the thread. Just report your original thread and ask the moderators to delete it for you. If you can keep it short and you think it will make a difference, you can even include why. The finale decision will be the staffs though, on whether to delete the thread or not. Just click on the word "Report" in the lower left of your original post (on the opposite side of the Reply and Like buttons).