Disclaimer: Content discussed is subjective. My interpretation is not the only interpretation.
Ok so we all know that Yuuri looks up to Victor as his skating idol, but I personally think that Yuuri was attracted to Victor beyond simply his skating abilities as well.
Just look at the posters in his room.
Like sure, you have pictures like these,
where Victor is doing whatever he does on ice, but a great majority of Yuuri’s posters are these,
These posters are Victor OFF ice. Victor posing, being happy, looking sexy. Victor, in these pictures, could pass off as a model instead of a figure skating legend. The fact that a lot of Yuuri’s posters are of Victor not skating implies that Yuuri finds Victor attractive for more than his skating abilities. Yuuri just genuinely LIKES Victor and LIKES how he looks off ice. The feelings Yuuri had towards Victor wasn’t just an admiration of how well Victor skates, but a crush towards him as a person. This might also be why Yuuri was so hurt when Victor mistook him for a fan (or just didn’t give Yuuri the response he anticipated). Because Yuuri has had nothing less than A HUGE GAY CRUSH on Victor for so long.