As much as I think gaku has a micro dick, he’s probably average but on the shorter side but probably on the thicker side for compensation. Since he is on the smaller side, all of the popular ships that he’s in (karura, yugamu, and Darumi I think) all make fun of his smaller size but they all secretly love his small size and even occasionally let him top to see how he preforms since he is very much not a top, just a fumbling bottom