The description of the Succubus in 5th edition D&D (MM, p284) seems a bit contradictory. Under Beautiful Corrupters, it says
Appearing in the guise of a humanoid who has previously appeared only
in the victim's dreams, the succubus or incubus seduces or befriends
its victim, indulging all its desires so that it performs evil acts of
its own free will.
However, under Deadly Kiss of a Succubus, we read that
(…) the recipient of the fiend's kiss gains no satisfaction from it,
experiencing only pain and the profound emptiness that the fiend
The stat block of the creature has a specific entry for the kissing action called Draining Kiss. (The Succubus does have the Shapechanger ability as well, but that does not disable Draining Kiss.)
So, maybe it's just me, but "indulging all its desires" likely covers a bit more than a first, and possibly last, likely lethal kiss — a kiss which would, by killing its victim too soon, prevent the Succubus from achieving her purpose, that is, making the victim commit the three betrayals.
In light of the above, the question arises:
Can the Succubus suppress the power and effect of her kiss?
(Sure I know I'm free to make whatever of the creature as a DM. What I'm primarily interested in is whether the official rules or the official "fluff" resolve this apparent contradiction someplace else, whether I overlooked something somewhere.)