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>>28193
I tried looking but will need more information to narrow search down some:
1. When you say "School boy", do you mean like a teenager or full on child/boy? Similarly, when you say that they are turned into a girl, how drastic of a change is the focus?
2. How animalistic are said ants on the sliding scale of furries? Are they basically humans with some chitin and maybe a thorax, or are you talking full on "boy gets turned into a girl then does a giant ant"? Similarly to the first question, is it boy->girl->ant, or boy->girl ant?
3. Are you sure it's a manga/japanese work?
4. Was there any text/do you recall it being in English?
5. Do you recall how it ended?
I'm browsing e-hentai/sad panda, and the closest I'm finding is a lot of Lunate art which 'almost' fits except none of their stuff is school age (child or highschool).