Which is a really really poor choice imo. There's already a bad end where kasyrra is implied to have done so to completion and is basically a emotionally empty ascended being, who knows how many years in the future after she finds you frozen in ice, think from the brint frost knight armor blacksmith fight. Sure they could deus ex machina them and go "NUH UH NUH UH YOU CANT FIGHT MY OC HE HAS LIKE 50000 EVASION AND IS LEVEL 50 XD" but there's a very easy route to have a evil end where you'd fight them and their religion's paladins, destroy them and absorb their power and get progressively stronger until finally you're the god emperor. Making an opportunity to push the combat system and difficulty to the limits and making them each superbosses, if every aspect besides tobs content needs smut then make every gods defeat require a sex scene to drain their power or something.
Characters that have their souls removed are shown to become stronger and your characters an anomaly, so just make it so after kas eventually removes your soul (if you choose) that you become not impossibly strong but strong enough to defeat one of the gods not expecting it so you're able to drain one and go from there. They've already got gameplay foundations, going off kiyokos abilities keros could be something like a Malboro from ff, or a trickster focused on stacking tons of ailments and damage on the party, Mallach could be extreme tease damage, lumia would be holy and combat abilities, nareva'd be long lost spells, the others haven't been shown yet but could follow the same pattern of matching their themes.
Sure it's a smut game and all but it'd be fun imo, some things lore wise you don't have a chance to see unless you have the opportunity to do bad things. Who stays with you? Would you have to slap cait against the wall before fighting Mallach? Kiyoko before keros? Etheryn before lumia? Azyrran and liaden fighting you? You'd have the chance for characters like brint or brienne to side against Gods and against the world itself, assuring their place as prime husbando or waifu. I dunno it just seems like a giant waste for all that potential and more to go to basic endings you can already see blatantly foreshadowed.