Kamisama Damono♥Because I'm the Goddess -

Goddess Pandora was sent to Earth to collect "gifts" that were spread among humans. She has a nice body that can temp anyone who looks at her, but when she uses her powers, she shrinks to a young girl's body. The only way to gain her power back is to kiss her reluctant peon, Aoi.
(Source: Tokyopop)

Kamisama Damono♥ was published in English as Because I'm the Goddess by Tokyopop from August 1, 2006 to April 10, 2007.