[@NightmareInd]  I was thinking maybe it starts in a pokemon league final with the 2 rivals battle and the younger one wins and the older one gets angry (or any action). This starts up the younger one's (preferably me) thoughts about how the older one looks cute when he is angry (or any action). This could work with pokemon as well and after that, the older one sees the younger one happy and look above and as they pretend to still hate each other they find their old friendship coming back from when they were kids but they felt something deeper and while the older one held back their feelings, the younger one was always giggling and blushing around the older one. The older one sees this and thinks there is something else going on and tries to investigate but when they do, will they find the truth of the love between them or will they think it is something else. Maybe ending with a confrontation.