I did a choc cherry port and fortified with double distilled shine mixed with Godiva liqueur. At 20% the Godiva was too low to fortify on its own without having to use an excessive amt. if you don't have shine, use everclear or a neutral brandy. That Godiva stuff is awesome, but super chocolatey and sweet, so use moderately.
Mine will be ageing for a couple years, it is fiery hot right now at about 18 %