Tsuna's Assassin Cousin

We all know about Tsuna, the future Vongola Decimo, his hitman tutor Reborn along with our other beloved characters. But what happens if our beloved Spartan tutor, Reborn, falls in love with Tsuna's cousin who just so happens to be just as dangerous as him. Chaos will ensue. (Warning: Mature due to violence) RebornxOc, TsunaxHaru