I was looking through the available SW doujins from C79, seeing what would catch my eye. Alas, the art in the majority of them sucked (IMO). This one, entitled “Karlsland Gunjin Taru Mono 1 ni Erica 2 ni Erica, 3-4 mo Erica Ika-ryaku da!“, I DID like, even if futanari isn’t normally my thing. I’m a sucker for dear Erica-chan though, so I made an exception ^_^ Erica/Gertrud (with a brief Gertrud/Yoshika flashback).
Title in English is roughly “What’s necessary for Karlsland soldiers first is Erica, second is Erica, third and fourth are also Erica!” A play on a line of Barkhorn’s from ep. 7 of the first season.