it features two university or highschool students. one art student uses very dark paint to draw black humanoids or shadows. They live in the same dorm or house. The room of the art student was filled with the black drawings. The other mc was curious about the art students and took care of him. I forgot if this was shounen ai or yaoi but it feels to have drama.
the story is about a horny musician seme who writes music after sex. he has sex with uke and suddenly gets inspired to write music.
This is not given or FLASHLIGHT.
Note: If i remembered correctly the title either used an italian word used in music or I misremembered words said by the seme.
It is not the manhwa love is an illusion. it had a different art style. The seme is a well known composer, pianist or violinist where he has sex with the uke because he looked naive. The seme then repeated to have sex with the uke since the uke usually inspires him to write music. In the manhwa it did not show that the seme liking the uke at the start.
The manhwa uses words like cressendo, stacco or something similar to that kind of musical terms.
I have already found the manhwa. It is named Kiss the Piano. The correct summary for the story is the Mc is a normal person who incidentally attends a party where he hears the ML play the piano and was demanded to have sex as payment for listening. ML then pursues mc as a fuck buddy to recover mentally before piano performances since ML has performance anxiety.
The mc is so cool that he does what he needs to reach his oshi.