Death's kiss

The caster puts on the lipstick and goes to a creature that is prone. The creature can make a strength check against the caster and makes a Constitution save throw. If the fail the strength check they take go unconsious and the caster has to kiss the target. On success the caster cannot cast the spell until a short rest. If they fail the Constitution the caster steals one tenth of the target's maximum hit points every round until the maximum reaches 0 and gains half of it. On success the only become poisoned by the lipstick. The creature can make more saves against the caster to stop the spell. If they do the still permanently loss the HP taken.

At higher level spell slots the spell becomes quicker. Level 7 spell slot is 5 rounds (30 seconds) until completely drained, level 9 spell slot 1 round instantly drained.