Troop of Beasts

From the introduction:

Welcome to the world of Troop of Beasts, an erotic Dragon Ball fanfiction by Jeckjack. This world's history is the same as the canon until the arrival of Kakarot on Earth. You see, he never hurt his head in a way that would result in him developing into the kind-hearted Goku. Fortunately, Son Gohan was more than strong enough to fend off the wild child’s attempts on his life, and so the old man kept the latter contained within the mountain range that served as their home. Bulma managed to get the fourth-star dragon ball from Gohan, but her adventure stopped after she couldn’t find a way to bypass the Fire Mountain. With no hero around, the Red Ribbon Army grew in power until a resistance was formed to oppose them.