I remember reading this (I think it was a) one-shot manga and I would really like to read it again! I think it was a side story/another story for a manga so I'm having a bit of a hard time finding it. Lets see the Uke (which was younger and a student) is in school and it took place in the art room and he was painting and using green (or something) and was talking to his classmate and said that he loves the color green and the reason he said that was because the Seme's name means green (I think) and he's also the art teacher. They were already together and so basically the story was that the Uke was upset that they hadn't do it in a while (I think) and the Seme eventually ends up taking him to a hotel. I would really like to read it again, if anyone knows it please let me know~! Thanks~

It should be chapter 4 from Never Complex

It is! Thank you!