This two part story is very similar in concept to a story told in Action Comics 761, whereby Wonder Woman and Superman have to spend a thousand years together on their own batting a savage horde of creatures in an alternate reality. To their friends and loved ones however, only a brief moment in time has actually passed between them departing and returning. That story explored how their feelings towards each other would develop and how loyal Kal would be to Lois, and this Batman issues seems to explore very similar territory.
At the last instant they pull back and both agree that it is wrong. Bruce declares how he is still in love with Selina after all these years and Diana agrees, saying she still feels the same about Steve Trevor too.
As they continue their seemingly never ending battle over the years, whenever one begins to loose hope the other is always there to encourage and support them and vice versa.
Meanwhile back on Earth Selena helps Julian meet his wife and spends some time with her, which Selina knows with every hours that passes is another year that Batman and Wonder Woman and trapped in Gehenna.
When finally she persuades hims that the time has come for him to return she has learned a little more about relationships having watched Julian and his wife together and as he finally departs back to his world and the weary Batman and Wonder Woman return home, she tells Bruce that the next time they are asked to fight the hordes of Gehenna she will be there by his side.