I Think I Turned My Childhood Friend Into a Girl Vol. 1 by Azusa Banjo

An LGBT+ romantic comedy in which nobody is quite what they seem, and everyone learns to be who they truly are.

It’s a familiar story: a popular high school student gives their plain friend a makeover and transforms their life. But this time, both the popular student and the plain friend are boys! Mido Kenshiro has loved cosmetics all his life, keeping his obsession a secret. But when his childhood friend Hiura lets Kenshiro practice applying makeup on him, the results are earth-shattering--for both of them.