Vore, sentient fat stuff, trans
But what about: your trans girlfriend's got a decently fast metabolism, so you only enhance her boobs for, like, a week or so before her body burns you off. But once enough of you is burned off you come back and, knowing how much she loves having you under her bra you keep feeding yourself to her, spending week after week on vacation as her breasts 'till you feel more at home on her body than anywhere else?
The Vulpine Club is a friendly and welcoming community of foxes and their associates, friends, and fans! =^^=