I'd really like to fill a couple dark, weird lines.
a. It's a long-haul journey to a new planet. They've just left the satellite fueling station, and settled into cryo, unaware that they have a stow away. The alien on board lacks the concept of what is human, but it recognizes fertile, genetically compatible individuals. So it begins a slow take over, taking over the best of the males, discarding the chaff. When it's finally ready, it wakes a suitable female, using itself and the human hosts to breed her.
Kinks: noncon/dubcon, 'tentacle monster', shapeshifting aliens, gangbang, forced orgasm, multiple penetrations, any other kinks in my green list.
b. The god that they worship predates humanity. It appears to them in whatever forms suits it, and the unwary might find that their divinely-inspired ecstasy has a sharp price. The benefits, however, are vast. Power, wealth, miraculous health. Years ago, the high priest took over from his father, but the god seems disinterested in him at best. Eager to curry favor, he prays and sacrifices, until suddenly, the god speaks to him. It has one demand. A bride. And it already has the girl in mind.
Kinks: human/eldritch god, rituals, non-lethal human sacrifice, multiple partners, deflowering, any other kinks in my green list.