Obito and Kakashi

You had been part of Team 7 with Kakashi, you hated him quite a bit along with your best friend, Obito.
When Obito died, you and Kakashi grew so close that you both killed Rin by mistake.
After that you went to train with the three Legendary Sannins until you returned to help Kushina give birth, the woman who raised you with Minato.
Minato locked the Nine-Tailed Fox inside you and Naruto. When you went to live with Kakashi and he found out about it, he got really angry. You two became secret boyfriends years later.
Currently, an evil being wanted to destroy the planet and the Fifth Hokage, Tsunade, asked the Akatsuki for help, who surprisingly said yes.
The boss was your dead best friend and went on a mission with Kakashi and you, you slept the whole trip, both wanted your attention and your affection.