I had a random thought a minute ago. Safe vore/endosoma can work extremely well as a metaphor for love, and this effectiveness isn't reduced by the love being platonic. Under the cut, I'm going to give a general safe vore concept, then abstract as much as I can for both the pred perspective and prey perspective. Hopefully it'll demonstrate the point coherently.
A pred and a prey care very deeply for each other, each wanting to show the other how much they care. They mutually come to the decision that the pred can swallow the prey. In doing this, the pred is accepting the risk that the prey could try to hurt them from the inside in order to have them in their stomach, and the prey is accepting the risk that the pred could try to digest them in order to feel the comfort and safety of the pred's stomach.
You have a person that you care for very deeply. You care for them deeply enough that you're willing to show them the most sensitive side of yourself. You want to protect them to the best of your abilities, even though that opens up the possibility that they could use this trust to hurt you. You accept the risk, letting them deep into your life and giving them all the affection you can give them.
There's this person who you hope cares for you as deeply as you care for them. You assume that they could hurt you if they wanted to, but trust them to not do so. You care for them so deeply that you accept being vulnerable with them, accepting the risk that they could take advantage of you in order to show that you want to be there for/with them, and to show just how much you appreciate them.