I'm seeking expertise regarding using iconically sexual creatures without leaning on that nature.
Specifically, one of the players in my group has a backstory that prominently features succubi as villains. I'd like to do something with that, but romance and sexuality are not a large part of the game. Per our Session Zero, these topics aren't off the table, but the PCs aren't generally motivated to sleep around, seek out romance, or do other things that would naturally bring them up. Two of the PCs are technically dating NPCs, but there is no major romantic roleplay; usually it is just the PCs checking on their associated NPCs during downtime.
Because sexuality isn't a big part of the game, I'm not sure how to use succubi in an authentic way. A succubus' iconic ability is draining life with a kiss, but any flirty NPCs that I put in are likely to come off as suspicious from a metagame perspective. I have considered making this a background detail (e.g. some NPC is seduced and leads the PCs into a trap) but I want to explore my options first.
What can I do to make a succubus a threat in a way that won't make the players immediately say "this NPC who's trying to kiss my PC must be a succubus or a vampire or something"? I would prefer to be able to use their kiss in some way, but I would like to know what has worked for others.
Scenarios and tactics from other systems might be appropriate, but I am constrained somewhat by Pathfinder lore.
WARNING: Spoilers for the Return of the Runelords Adventure Path...
The PC is a follower of Nocticula's Cult of the Redeemer Queen. She was originally a demon lord of darkness, seduction, and lust, and her traditional worshippers are succubi and similar. However, her religion is undergoing a schism because Nocticula is rejecting her demonic nature. In Pathfinder 2e she's actually finished this process and is no longer a demon, but our campaign is set during the schism, when she grants magic to both sides. As such, Nocticula's traditional followers like succubi are hostile to the PC.