"Ano Yoru ga Ichiban no Shiawase Datta Kara" Hakugai Ryuu Musume to Genkai Koroshiya Jingo Wasurete Kemono Ecchi

The day after Tia, the persecuted dragon girl, and Nana the assassin met and opened their hearts to each other. When Tia opens her eyes, Nana is nowhere to be found. After finding a letter he discarded, she learns he will be executed. Though Tia hates dragons, to save Nana, she transforms and flies as fast as her wings can carry her to save him. After rescuing him and fleeing for their lives, their hearts clash once again. No longer bound by their vows, they make love to each other like animals...