Roy was taken aback.
According to Sermias's personality, he wouldn't normally say such things. For him, sexual matters didn't carry concepts of "dirty" or "clean." Being intimate with her was as natural as drinking water, eating, hunting, or fighting.
But he did say it.
After returning to his hometown of Arson, in this not so private room.
Roy stood on tiptoe and kissed Sermias's lowered eyelids. She seemed to understand his thoughts.
The elves of Arson are naturally indifferent to desire, perhaps only becoming intimate with a mate every few decades or centuries. Moreover, they don't indulge in physical pleasures, and such acts are almost always brief and never excessive.
Sex is endowed with a sacred concept: procreation, life, and legacy.
It's not about passion, pleasure, or physical enjoyment.
So what Sermias is seeking now is considered "filthy." He's willing to let himself be stained with the color of lust, and he hopes so.