I went through multiple playthrough to explore what the game had to offer, mostly the lewd parts tbh. When i came accross Cordelia offer to use some magic that's the one she seemed the most excited about. I chose that for that reason and out of curiosity, without knowing she was talking about shrinking. Then the story goes on, i learn what's her plan and she's even more excited. She then asks if i'm fine with that. I'm like "ok... not my kink... but she seems happy". And then she asks me what i like about it, Giantess, Being shrunk, or both. And i'm like "erm... neither, but you're excited about it, so sure let's try" but there is no choice that covers that. I think that could be a valid option to add to your game. Basically indulging her kink, because it does sound like it's her thing.
I mean personnally i went for cuddles, second fav is me being a dom and her a sub. She's cute when vulnerable even if it seems a bit out of character to me. Then magic, i mean she is a really powerfull mage and all, and i was curious. Then i went vanilla, and then me sub her domina.
But overall i do think that both the text and the voice acting point out toward the shrinking to be what Cordelia would choose. So i guess it could bring brownie points to be like "erm, that's your thing, but sure lets do it", or just a bit more depth to the characters.
Also maybe do offer the player the ability to fail the test with the wolf cub, like the possibility to attack it or whatnot. This would lead to a game over sure, but that would be an additionnal choice. Not everyone would feed or pet a wild animal, even knowing it could belong or be the witch they are looking for.
Nice game by the way. Not used for the narative part to be voice acted though, but with the trend of audio books and stuff... I mean i often complain about visual novels not being voice acted, but i mean the characters. Not that it is a bad thing, it just surprised me. I hope it won't make the game to heavy/big in later updates.