Pheromones of the Kitsune

Minato couldn't bring himself to seal the Kyuubi into his own daughter. What happens if he grabs a boy from the orphanage instead? Kushina survives and raises both Naruko and Naruto, the boy they sacrificed to be the Juunchiriki. Naruto is grateful to his family for taking him in and will do anything to repay that debt. The Kyuubi doesn't agree. (OOC, Mostly Smut Story and Harem)