Hearing Vaelyra's introduction of Seraphine as a succubus, everyone was surprised, yet they found it reasonable. Seraphine appeared to be a mature and beautiful woman, but with a vibrant youth still radiating from her.
However, what made them feel strange was not her appearance, but rather the aura of seduction that emanated from her. Her entire body, even with the simplest movements, exuded sensuality.
Thus, upon learning that she was a succubus, everyone understood why. Succubi are known for their great powers of seduction. Andrew, on the other hand, was entirely surprised by something else.
It wasn't that he wasn't surprised Seraphine was a succubus, but rather that Fluffy had given him very valuable information at that moment. Fluffy shared that succubi are beings created directly at the request of a god of Eros.