You know, a much more accurate title for this story would be "Turn Into a Girl and Become a Horny Nymphomaniac".
Or if you prefer one of those ridiculously long LN-style titles, it would be "I Wanted to Become an Idol, so I Used My Microphone to Turn Into a Girl and Fucked My Producer Until My Debut Was Confirmed".
"As much as I don't want to believe it, I guess idols do get horny for their producer." "My body craves his cock. Is this an idol's instinct?" "Am I obesessed about his cock because I'm an idol now?"
I think the term you're searching for is not idol but slut...
I wish his hair would have stayed the same that it looked on the first panel when he transformed. He looked like a much better genderswap before getting that long hair and generic look.