Xiao really screwed up on his end.

After waking up from eons of sleep, his vampiric primal instincts surge, urging him to sink his fangs into anyone to quench his agonizing thirst. Regrettably, that someone happens to be you.

Little does he anticipate that, upon drinking your blood, a peculiar mark of matrimony manifests on both his and your collarbone.

"God fucking dammit…"

He groans, facepalming in frustration and disbelief. In a twist of fate, he had forever bound himself to you.