manga about a girl who pretended to have a boyfriend from a picture she found and it turns out he is pretty famous and she begged him to pretend to be her boyfriend and at the end of the story it turns out he was in love with her before she met him which is the reason why he pretended to be her boyfriend for her. it was like one chapter I don't know if it was a one shot or if it was and extra chapter from a different manga that was being used as a filler. Please help me find it!

It's not a one shot, but it kinda sounds like Ookami Shoujo to Kuroouji