Probably cordial relations.
The Reich would be badly overextended in a victory scenario.
I don't think that 1943 Turkey is in the position to push any claims. They would be busy trying to prevent the chaos from the collapsed SU and the (suddenly decolonized)Middle East from spilling over.
Maybe a small land grab in the Kaukasus.
Well with the Genocide against Slavs, Germany would only have a few territories that would have a lot of strive, that they could manage a lot more efficiently. Turkey really wasn't in the mindset of expansion. They certainly had the ability to reinstate the Ottoman empire, but they became a republic, which wanted Anatolian Turks as the majority. But when the Nazi's were starting to win, Turkey would probably join the Axis and enter a trade relation with Germany, giving extra manpower, and oil to Germany, so when they win, German-Turkish relations would be off to a really good start.