i forgot the manhwa title.

a bit borderline manhwa. where mc write or draw some ecchi manga in classroom on the book. after school, he forgot the book. and fmc see the book. when mc back to the classroom to he see fmc read his book.

if iam not mistaken, fmc ask mc if she can join him to write the story.

on some chapter in a park, fmc ask mc to show his d when it hard. the manhwa didnot picture the d but just fmc face focusing the d with a note and pen in her hand to write adult story. unfortunately mc ejaculated in her face.
the manhwa didnot show that but change it with some girl opened sport drink bottle and get her face wet.