3 ideas
Moggadeet, a spider-like alien, narrates how he fights the instinctive 'Plan' and the 'black' rage it brings. She grows huge and devours him to nourish their young, and he recognizes, dying, that his rebellion of tenderness was the Plan all along.
A creature that consciously resists its biological programming can find that the resistance itself is part of the program. The feeling of choosing love over drive is the mechanism the drive uses to deliver the organism to its reproductive fate. Subjective freedom and biological determinism are therefore not opposites. The experience of freedom can be one of determinism's tools.
Transposing mating, hunger and gender onto nonhuman bodies strips away romantic convention. That exposes how much of human love may be appetite, compulsion and reproductive machinery. Because the reader sympathizes with the alien's voice before noticing its biology, they are forced to see their own erotic life from outside.