did also appear a minotaurus in the story and join the harem? the guy had a sex story with every monster who appear in the manga.
Same author, but different story in a different universe. The manga you're talking about was about a bunch of brothers (who were strangely identical to each other) and their monster girlfriends. This Monster Musume has some character designs that are similar to the ones in those old strips, but they're not supposed to be the same characters.