Xanxus takes the power struggle between him and Tsuna to a different level, but it doesn't work out the way either of them expects it to.

Tsuna and Xanxus get married. Tsuna and Xanxus get even.

The arc in which Tsuna tames Xanxus. Sort of mental Tsuna/Xanxus, not always in an amiable way.

Growing up in the Mafia isn't necessarily an easy or kind thing. The earth spins, life moves on, and Tsuna finds himself taking slow steps forward, back and forward again. (Or, ten times that Tsuna remembers it being easier to have sex with Xanxus rather than dealing with the insanity of the world around him)

In which Xanxus has been hiding that he's a Home Sky - and Tsuna's his War Sky.

The War against Byakuran had been desperate, and the backlash against something he tried had thrown him back in time. He made a plan, but ...