Look, I'll be blunt - I want to see her nipples, plain and simple. She has teased me for long enough.
A thong just wont cut it anymore...
Here's the paradox of desire. The reason we are drawn to Tomoe is that we have watched her grow from an awkward little girl into a funny and charismatic teen (who also happened to have a lovely, tight body) and now that she is on the verge of adulthood we can't help thinking "Now I might be able to finally (and legally) see the parts that have been hidden!"
But even now we can see that Tomoe has grown into a fairly undistinguished young woman. Her body is flabby and out of shape. Her breasts are completely average in size and shape. Her charisma and charming sense of humor have been strained to the limit by the fact that she is now basically doing soft porn, and she can no longer pretend to be a girl striving to become a successful model/actress/idol. If this girl did not have that long career as a junior idol behind, and just showed up out of the blue looking like she does and making videos like she's now making, we wouldn't give her the time of day.
It's those memories of what she was combined with the titillation of the forbidden (nipples, etc.) that keep pulling us along, but the sad truth is that the day she shows us her nipples is the day the magic spell is broken, and we will all feel just a little sick and try to forget about her.
A few junior idols have gone on to do nude work. Whatshername (See? I can't even remember her name. The girl who was kidnapped by relatives at the peak of her career.) has done some tasteful nude stuff and looks great, but I can't think of another example where a junior idol showed us her nipples and it wasn't a huge disappointment. And it's even worse when they go into AV. Like that girl with the buck teeth. (See? My brain is trying to forget these girls.)
Be careful what you wish for. Sometimes the forbidden desire is best left forbidden.