Rainbow Dash, quite accidentally, learns she loves flying naked, without the panties that mares usually wear during heat season.

Mares in Equestria sometimes wear panties during heat season, when their private parts become more visible. It preserves their modesty.

Screw modesty; what Dash loves more is showing off.

Note: Story is rated M, unlike my other stories.
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https://www.fimfiction.net/group/217703/no-nut-november-clopfic-contest
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https://www.fimfiction.net/story/401807/always-in-style