Magicalize is an ecchi manga about a magical girl who is very powerful, but often has her costume ripped away during battles. This is basically her weakness.

In the story below, a beautiful female police officer is investigating a perverted cult. This cult of men has kidnapped and drugged a girl.

The female detective finds the lair where this cult meets and rescues the girl. In order to do that, the detective takes her place. The cult members tie up the detective and tape gag her.

The entire sequence has a lot of nudity, but it's really fun.

You can view the manga here: http://kissmanga.com/Manga/Magicalize-Inomaru