Kiss and fuck and stay alive (слэш)

Based on the prompt: Loki is about to kill Tony. Tony kisses Loki for the hell of it before he can. Loki is so shocked that he doesn't kill Tony. He drops him like he's been burned in fact. Then it happens again. Tony learns he's quite okay with bartering his mouth (and other parts of him) to a God if it keeps him kicking. (Loki learns it's all fun and games until someone starts getting fond...)