Description taken from DA

Princess Ember has challenged any of the male dragons to please her by any means. She is also aware of humans mysteriously ending up in Equestria as micros and very few of them have entered her dragon territory. Although she's helping Twilight find them she wants to keep one to herself to offer the same challenge to him to satisfy her in the same way the male dragons do and doesn't mind one bit getting interspecies with a human.

Anyway though pleasing someone as tough and energetic as Ember is like tryong to earn the favor of many different rulers all over. Smolder acts as Ember's personal assistant and a little sister type to her. Ember is easily able to make even the most strongest and largest dragon yelp in pleasure without no effort used, whether it be light tickling in the right places, a quick grope on their male dragonhood or tail-wrapping them up. The male dragons are having a difficult time pleasing Ember as far as pleasure goes. Ember doesn't directly have sex with the male dragons, but she fondles, gropes and sometimes wrestles with them to put them in a pleasurable sleep. If any can satisfy her then they can marry her and have sexual intercourse with her directly. She's really strong though no matter what size she becomes and her powerful and hard dragon scales makes this more difficult for them. She'll even eat some of them if they step out of line and make them stay in her stomach for a day or two as a personal prison since they can't die from her digestive acids due to being dragons. However though, if they really ticked her off which is a rare case thankfully then for the extra humiliation and embarrassment on their end she pass them through bowels.

The male dragons love this challenge a lot, but at the same want to figure out how to tame a dragon this sexy since they can't mate with her until one succeeds. Fortunately, there are two familiar dragons that have practiced and practiced a lot and learned some techniques to satisfy the fiesty tomboy. As she looks down at the two she recognizes, she scoffs at them and allows them to have at her to see what they're capable of.