Responses
https://www.mangago.zone/read-manga/over_cumming_writer_s_block/ uhh not sure about the second part, but the first part matches this.
Is it this one? https://www.mangago.zone/read-manga/watashi_ni_xx_shinasai/
Not the right one but ty for trying to help :)
Yess! Thanks a lot!
The girl is a writer and ends up blackmailing this black haired dude to helping her get "ideas" to write more stuff. She has a close friend with white hair and very shy, who always loved her but she never returns his feelings (all in school life)