Did you know your succubis don't have tongues? Their [BODY:stuff] lacks either FORKED_TONGUE or TONGUE.
Also I've been fiddling with their kissings after my fort died to some crash I couldn't figure out.
So I humbly suggest these values:
[SECRETION:LOCAL_CREATURE_MAT:VENOM:LIQUID:BY_CATEGORY:LIP:SKIN]
[SECRETION:LOCAL_CREATURE_MAT:VENOM:LIQUID:BY_TOKEN:TONGUE:SKIN]
[ATTACK:BITE:CHILD_BODYPART_GROUP:BY_CATEGORY:HEAD:BY_CATEGORY:LIP]
[ATTACK_SKILL:BITE]
[ATTACK_VERB:kiss:kisses]
[ATTACK_CONTACT_PERC:6000]
[ATTACK_PRIORITY:MAIN]
[ATTACK:LICK:BODYPART:BY_CATEGORY:TONGUE]
[ATTACK_SKILL:BITE]
[ATTACK_VERB:lick:licks]
[ATTACK_CONTACT_PERC:6600]
[ATTACK_PRIORITY:MAIN]
They still tend to lick adversary's brain into parts from time to time, but mostly they pass from exhaustion while liking if it's the only attack available.
Also, that SECRETION bit on the top does the trick for poisoning. Not 100% guaranteed but still extremely likely to affect.
And lastly, I think syndrome like this better qualifies as paralysing kiss.
[CE_PARALYSIS:SEV:200:PROB:100:RESISTABLE:SIZE_DILUTES:START:0:PEAK:1:END:200]
[CE_DROWSINESS:SEV:100:PROB:100:RESISTABLE:SIZE_DILUTES:START:0:PEAK:1:END:200]It makes human partially paralysed and, unlike the current one, kicks in before the target is already dead.
As for [CE_SPEED_CHANGE:SPEED_PERC:75:START:0:END:300], I'm not sure I've noticed any effect in arena.
edit: Okay, secretion may be not the best solution to the problem. When you play fortress mode you'll get fortress slobbered since they tend to drool into every pool of water, the rain also doesn't make things better. Guess it must be done with interactions.