[Drops! (Otona no SEXY Ehon)] Shinsei Mucchi Muchi Inaka Seikatsu Digital Comicalize ~Otokomasari na Kanojo ni Manatsu no Asedaku Shidou~ Mosaic Comic Soushuuhen
@lovemanga2086 pretty sure its like most of this author's works' setup, tomboy gains massive feminine weapons after growth spurt and becomes the kind of tomboy slut where the sluttiness derives from the tomboyishness