Starts off with papa finishing up on a mission promising himself to live a normal life if when he manages to escape, a woman calls down to him while he is swimming away and yells to him to please take her child and keep him safe before throwing her son down to papa before she,what appears to be, dies. Papa takes the boy to his mother's house where he names the boy Ryuunosuke (Ryuu) during a misunderstanding with his mother, she thinks the boy is his biological son. Papa considers dropping the boy off at an orphanage, but the woman who threw him her son keeps popping up in Papa's head so he feels to guilty to just throw the Ryuu away and decides to raise him as his own. 17 years pass, Ryuu and Papa are now living relatively normally, but it is revealed to us that Ryuu is in love with his Papa. We see that Ryuu is actually living a secret life feeling shameful for his feelings towards his Papa and looking for comfort in his best/sex friends Gon and Aya. One day Papa finds a gay porn mag under Ryuu's bed and it really worries Papa for a while there until a teacher calls Papa to school to discuss Ryuu, Aya and Ryuu had been caught having sex in school which puts Papa at ease because he was worried Ryuu might be gay, in this moment of relief he accidentally says "i'm glad you're normal, i was worried you were gay" not realizing how Ryuu feels about him and later finds out Ryuu is dating a man that looks strikingly similar to Papa himself. Things reach a climax as Papa receives a paper stating that his parental rights over Ryuu have been revoked legally and hears from a contact that he is being targeted by someone. Papa takes Ryuu and the two flee, Ryuu taking advantage of the situation by saying they should act like they're dating so he can be more touchy-feely with his Papa. The rest is ongoing. Looking forward to more chapters~
Papa's Assasin. - Ryuunosuke Wa Tonde Yuku.