Guys, angel race in this novel does not have any gender, but they will manifest their appearances at age of ten without their own consent.
Angels have the appearances like females and males, but they don't have any gender. They don't have private parts, they can not reproduce.
But, they can have intimate relation with each other because they have soul immersion, where their souls would merge, immersing into each other.
Angels in these novel can retract the wings in their body's as they wish.
All angels got birth from life pool.
Now, don't ask me how first angel came, or who made the life pool, because this information involve a big plot.
Gods with their divine energy can promote the growth speed of any living beings.