well i was just saying that since it is a kids show (i am guessing since i haven't watched it), and since the artist has no suggestive sexual or explicit sexual material on their pixiv, and since "märchen" was used as a catchphrase for otoha (wishing bell happiness?) that the first thing that came to mind for me was 'cute exclamation' not 'wild sex on the floor' lol :P
of course going purely by the definition of euphemism, that could have been the artists intent all along XD it is reasonable to look at it both ways i think ^_^