e621 cum dragon duo female feral garchomp lying male male/female membranous_wings missionary_position nintendo nude on_back open_mouth pokémon pokémon_(species) salamence scalie sex unknown_artist video_games wings
 

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Since there is no known artist, and no point of origin, there is no way to be 100% certain of the genders of these two since there are legs obstructing a proper view.

Adding ambiguous.

Garchomp is lacking the chunk hole in the back of the dorsal fin, so I'll leave the female tag for that, but very few artists pay attention to those gender differences.