So I just finished a book where this was the central dynamic, and I'm still emotionally wrecked. The hedgehog dilemma isn't just about creating tension—it's the tension. When two characters desperately crave intimacy but every time they get close, they end up hurting each other because of their own unhealed spines (trauma, trust issues, past wounds), that's not just a subplot. It's the entire engine.
Take the romance in 'The Unbearable Lightness of Being'. Not a romance novel per se, but the push-pull between Tomas and Tereza is pure hedgehog. He wants his freedom, she needs his fidelity, and their love is this painful, beautiful dance of coming together and pulling apart because their essential natures wound the other. The tension isn't from a love triangle; it's from the fundamental paradox of needing what also hurts you.
For it to work, the spines have to be real, not just plot devices. The reader has to feel the genuine ache of the 'close enough to share warmth, but not so close we draw blood' calculation. When done right, the resolution—the finding of that perfect, careful distance—feels more earned than any grand, sweeping declaration.