Dekoboko Sugar Days Series by Atsuko Yusen

Yuujirou Matsukaze has been close friends with Rui Hanamine since the two of them were children. Back then, Yuujirou was the one who stood up for and took care of his adorable, soft-hearted friend. But as it turns out, Yuujirou's childhood dreams end up growing a little too big to handle ― or, rather, too tall! At over six feet in height, the cute and easygoing Rui towers over his would-be protector... and still has no idea Yuujirou's had a crush on him since they were kids!

Tiny and adorable when they first met, Rui—still just as adorable—now looms over his boyfriend, Yuujirou. Though they were little more than best friends at first, the confusion over their true feelings for one another smoldered until they confessed... moreTiny and adorable when they first met, Rui—still just as adorable—now looms over his boyfriend, Yuujirou. Though they were little more than best friends at first, the confusion over their true feelings for one another smoldered until they confessed. Now every day passes with such overwhelming sweetness it’s all they can do not to ask themselves, “am I allowed to be this happy?”The final high school judo contest, the last summer of their high school careers, and beyond…the thought of his future with Rui makes Yuujirou’s heart flutter.A slow-burn love story between a diminutive, athletic teen and his towering, kind-hearted best friend as they journey the slightly bitter road to adulthood towards sweeter days. less