
Boobs and Butt Pose of Wordly Affairs
She's doing the boobs and butt pose because as the succubus of worldly affairs she has to be able to seduce across cultures and the boobs and butt pose is an internationally recognized symbol of sexiness.
(Card art of "Succubus of Worldly Affairs" from Cardfight Vanguard TCG, Bushiroad, submitted by anonymous)