Ooof. Yeah, my self-esteem would take a huge hit if it was normal for those of my age to have already learned how to breathe fire and yet I couldn't even belch the tiniest flame.
I guess it's just weird to see him with other patients since he spent so much time taking care of his wife before hand.
Well, it could be Apothecary-san, but I'm leaning towards "no, just looks similar" myself. This set is titled (at least as far as google translate says) "Demon Academy Student Counseling Room." Since Apothecary lives out in a village and does more general medical/healer work, unless this is him later in life after marrying Reszurre and getting a new job it's likely just a lookalike.
Which speaking of, the fact that it's a 'faceless male' rather than the Apothecary also lends to it being a different character.
I'm already 16 years of age and yet...And what's more, I...I am still unable to breath fire...!Is it... normal for you to be able to breathe fire?It seems even a young demon kin noble like her has own problems to deal with. Must be rough.