I'm looking for a shoujo manga where the main girl is in high school. At school she's quie...

I'm looking for a shoujo manga where the main girl is in high school. At school she's quiet and plain but after school she does erotic modeling for her cousin. The guy she likes, Ryuu, is a fan of her model persona and often looks at her pictures in magazines. Somehow he starts talking to her in school and finds out who she is and goes with her to one of her shoots. There he meets her cousin, also named Ryuu and the one that got her to model, she calls out the name Ryuu to the camera. He thinks she likes her cousin and gets jealous.

Does anyone know the name of this manga?