You already did this steps?
1- Play scene one of the male bear with the skinny girl at the park (she is at the entry of the park).
2- Continue the interaction but playing the second scene with the same girl and your same male bear.
3- When finish the second scene, doesn't turn that girl into a monster.
That must make Cloy tell you a message informing that a new spell has been unlocked (futanary) at her store, and you will be able to buy the spell at Cloy's store for 60 points.
The message about your container is due to having only one container and that container at level one (max of 50 energy points). To buy a new container you can do it in the same Cloy's store for 50 points, that will make you have two containers with a size of 50 points, allowing you to store 100 energy points.
If you haven't one of both conditions, two containers or first container in level two or three, Cloy won't tell you that message, so you are having only one container and at level one right now.