How about Playtime with Mrs. O'Leary? Bonus points if you also include Cerberus. That big guy needs some love and time off as well.
Oh my god.
Nico is waiting for Percy & Mrs. O’Leary by the shore of the Styx. Percy has brought a whole bunch of red rubber balls, and some specially made frisbees he had to bribe Leo into making. They take Cerberus out onto one of the plain fields close to the doors, just in case something happens, and as soon as Cerberus sees the red balls, he pounces Percy. Nico has trouble getting him off again, and in the end it’s actually Mrs. O’Leary that does the work.
When Percy has recovered from being doused in hellhound drool, he sits with Nico on the side of the field and watched the two huge dogs bark and play and wrestle. Every now and then one of them throws a frisbee or a ball, and it’s probably the most fun Cerberus has had in decades. (Nico has a really good time too, not that he’s gonna say it.)
When Percy and Mrs. O’Leary leave again, they both kiss Nico’s cheek - thankfully Percy gets to it first, no one wants to kiss a cheek that has been licked by a hellhound - and Nico turns just as red as the rubber balls.
Hades sits in his palace scowling, grumpy because Persephone won’t let him go and throw Percy either out of the Underworld or into the dungeon. The argument lasts exactly two minutes and ends with Persephone telling Hades off because Percy is doing a better job making both Hades’ son and Hades’ dog happy than the god does himself.