Responses
1. Sachie is the mother of Ia's child. its implied at the end of chapter 16 that the two shared a bed.
2. yes, ciel forgot he is an angel he has amnesia. by "return him to normal" jake is referring to ciel. he wants ciel to regain his memories and be who he was before the amnesia.
1. The child ren met at the end, is that,, ia's child??? Who is the mother tho? Ia???
2. The way jake talk with ciel in the last chapter, does that mean ciel is an angel too but he forgot about it? Also, what did he mean by "return him to normal"? Who is this 'him'??
In conclusion: this should be incomplete right? There's so many misteries