Cehd'ra will be his 'normal' half-snake for three moons so if you're down with scalies they could for sure have an interlude during that. If you're including pheromones with Takame's transformation that'd be a really easy opening. Otherwise during the Sanguis cycle Cehd'ra's going foxy and actively out looking to seduce people with his own pheromones. Which would you prefer?