I'll be honest, considering the other pic of the same author with the Bodied Reisen and Tewi, one would had expected the author to make the Bodied Flan to have the typical anime ultra short gym pants out of producing the same "effect".
Whoever the author is, he seems to love to make the yukkus in this kind of situations =A= at least based on his previous "suprise skirt lift" Remyria, the Hadaka Apron Reimu, etc.