Ryusenka
If Serafall is Dumb enough to act like a Devil of Greed when she goes there to Kyto to reforge the devil race’s relationship with the Yoki so they get the needed ingredients for medicines. She'll say something Like "I want him," leaving it ambiguity at best, which in turn makes Yasaks slightly unhappy thinking she wants her to mate how she does but also understands, based on the MC power, how females in the supernatural are drawn to powerful mates even Susanoo might think it too and may not be thrilled the human his sister like to dance with is coveted by devils and find it acceptable if it was a physical want. Still, his divine power probably tells him it is not that, and it is more to reincarnate him into her peerage. As he also likes to fight with Ryan, his sister's affection for the young man, and his firm connection with the Yoki via Yasaka and her daughter, I could see the god of storm release killing intent the moment the piece falls into place if Serafall voices that thought.