You see how a great shine covers your sight, that slowly disappears and makes you see clearer, when the shine disappeared you look at a mature naked woman in front of you that the only thing she's wearing is lab coat. "Welcome to the world of monsters," says the woman to you, "In this world you'll find a variety of creatures that will accompany you through your journey" she says as a big wolf appears next to her, then she took out a device similar to a phone and clicked something on it, after that, suddenly a shine covered both the woman and the wolf for seconds later reappearing only the woman as a new creature, it looked similar to her, but now her legs were covered by grey fur replacing her feet with paws, she had now 4 arms that were also covered by grey fur with claws as her nails, her chest had 6 breasts on it, her face she had a snout instead of a normal nose and her ears were wolf-like in the top of her head. "As you see, here you can fuse with one or multiple of these creatures after they get attached to you, many people do it for fun and go out like this, but the principal attraction are the erotic battles that people do with these forms were they compete to make their opponent cum" the woman took out the device again and pressed another button, regressing her and the wolf to their original forms.
"Now that you learned about the world of monster fusion, you're ready to start your adventure, but first I would like to know something important before we go to the next part, are you a girl or a boy?" the woman asks you.