History repeats itself. If the show is going to refer to Jon as Aegon (as stupid as that is) then Jon/Aegon will repeat history and marry into his family, via Daenerys! Why? Because they have fallen inlove, DANNY WILL BE PREGNANT, and because that's something Targaryens can legally do. Plus, if Danny wants her claim to the Throne (something she cares about) and Jon is technically the one with the legitimate claim to it - then a marriage would make sense! It would also give their baby a legitimate claim of Succession. Which they will have in mind, despite we as an audience knowing the ending of the show is going to be "Bittersweet"...