After Exchanging Souls with My Little Follower, I Became Invincible

I, Xie Qingyuan, am the No. 1 Lieutenant Colonel and have never lost a fight. She, Xu Xingmiao, my little follower, has never failed to be clingy. Until the sky cracked and monsters descended, I awakened the S-level ability [Death Wrap] when I was on the verge of death - full power at the cost of a short life. And she awakened the S-level [Source of Life] - which can heal, strengthen, assist and fight. Two top S-class abilities, until we hit the same stone... Wait—why am I in her body? ? ?