Looking for a BL

Hey guys! Please help me find this one! I forgot the name of it agghhh. All I remember is that it's a japanese one, the top and bottom were dating since high school but the bottom moved away for college but they still kept their relationship going online and sending stuff to each other. The top went to visit the bottom by surprise and the bottom never told the top that he had gotten a growth spurt and literally ended up being taller than the top now. He was afraid the top wouldn't like him anymore since he wasn't cute anymore. They ended up becoming a switch couple. I remember that they fixed something up for the la lord at some point?? It's in black and white