Seraphine didn't know how to react to the enthusiastic response of Andrew's wives. In fact, it wasn't just Andrew's wives who dragged Seraphine along, but all the women present went with them.
Even Sansa and Canna, who are the most reserved. The succubi being blessed by Eros just like Andrew, although to a lesser degree, had knowledge about eroticism and sex that the girls wanted.
Being Andrew's wives, apostles or guardians and him being a candidate for the god Eros, the girls had acquired an affinity to this domain, so they were very interested in learning new things regarding this subject.
It is true that Andrew is much more versed than Seraphine and any living being in this world when it comes to sex and eroticism, but it is difficult to communicate some things as a man.
