So, a bit of OOC transparency on how the succubi work (since again, they're rather different from "normal" monsters):<br/><br/>First, they are able to raise a character's pleasure by simply touching them (as a touch attack).  It's a small increase, but it prevents pleasure from decreasing for a round as well.  If a character is being grappled however (either by the succubus or another monster), they're able to give the character much more pleasure by caressing them, and can also try to bring them to orgasm (and cause ahegao damage).<br/><br/>Next, they also have a modified Charm Person as a spell-like ability.  It's limited to only charming one character at a time however; if it's successful on a second character, it stops working on the first (but if it fails to charm the second character, the first one is still charmed).  Charmed characters don't consider being held and pleasured by the succubus as a "hostile" action, although the succubus will need to succeed on an opposed Charisma check to keep the character from trying to escape.  Being grabbed by a tentacle monster, however, does count as being threatened by the succubus's ally, and ends the charm.<br/><br/>Of course, they might have other abilities, depending on how powerful they are (the stronger succubi have higher level spells and other abilities), but those are the main rule-changing things.