ComradeAnt's manga / #Mystery(2)

They were experimented on at this prison and blonde boy had never experience kindness until dark hair boy. And an irrevocable attachment is formed. They are separated and reunite later in life but dark hair boy does have his memory. A lot of mystery and intrigue. No smut.

Private detective saves twink and they become attached. They become the detective’s assistant and grows to love him. They fall in love. Oddly translated and hard to understand