Kissing the Villain to Survive

I transmigrated into a novel as a doomed side character with a terminal illness and less than five years to live. My only lifeline? A bizarre system that forces me to steal luck from the story's cold, arrogant villain through increasingly intimate missions—holding hands, hugging, kissing, and more. To survive, I have no choice but to shamelessly "leech" off him. But when the icy young master finally asks if I like him, I panic and run to someone else. Big mistake. Now he's cornered me with dangerous eyes and a possessive smile: "Can't I be the one you choose?"