The nature of WWII society, with its strict moral and military codes, made it very challenging for gay relationships to be out in the open. While there may have been gay soldiers or civilians involved in relationships, any sexual aspects would have been deeply concealed. So, in terms of well - known historical records presenting 'gay sex stories', it's almost non - existent. We can only speculate that in the midst of the chaos and upheaval of war, some gay relationships may have formed, but the details would be lost to history.
Most historical research during WWII focused on military strategies, political events, and the overall war effort. Gay relationships were not something that was openly discussed or documented in the context of the war. So, finding explicit 'gay sex stories' from that era is extremely difficult. There may be some fictional accounts in modern literature that attempt to explore this hidden aspect of the time, but these are not based on hard historical evidence.