The phrase "suki na dake" (as much as you like/love freely) suggests a one-sided abundance. The substitute is permitted to pour all their affection into the partner. They can love "as much as they want" because the partner is passive, perhaps even indifferent, accepting that affection not because it comes from this person, but simply because it is warmth. It paints a picture of a relationship where one person gives everything, while the other simply takes, looking through the giver to see the memory of someone else.
: The first episode was released in December 2020, followed by the second episode in February 2021. ano ko no kawari ni suki na dake work