Now who's overthinking things? It's neither a test nor a gesture nor anything else, really, just a way around an uncomfortable moment. Hasn't Chrollo always been willing to bleed for his loved ones?

So, practical. He watches his blood fall, silent and in droplets, onto the pages without leaving a stain. And as he watches, the pages flood with writing, and images.

Accepted.

...Chrollo's expression doesn't really change, at least not at first. He'd known it would work, by some definition of "known." It isn't as though he'd doubted Hisoka's affections. Even so... after a moment, when he closes his open palm and stops the blood flow, he smiles.

"Ah."