Sonic and Tails fuse together by using their Chaos Energy, their power formed a light sphere absorbing the boys, also their gloves, socks and shoes in order to form their fusion. I think it should be painful for the boys while fusing together at first, but they will overcome the pain soon. Since their gloves, socks and shoes were fused and applied to their fusion, they would be completely bare inside it. Don't worry, the boys would have their gloves, socks and shoes on when they defuse together back to normal, unless they took them off before fusing together. The boys would need a Chaos Emerald each in order to fuse together. I feel like the fusion dance is getting lame, or should I say it is wearing thin, so I made their fusion process more different. I also made the power more intense which would be painful for the boys at first. I don't want to hurt the boys too much, but I feel like it will make sense.