[Varyon]

IIRC, the Healing Advantage has difficulty curing diseases, so given a succubus’ likely activities, some degree of Resistant to Disease (perhaps even outright immunity) would be appropriate, and plays well with their “energy of creation can be used to heal” theme. You can optionally restrict it to only affect STI’s/STD’s; I’d assume that is one category less common than diseases in general. I’m not certain exactly what happens if a character under the effects of something Resistant would work against suddenly gains Resistance, but if it’s a reroll to eliminate the status, putting Affects Others on a succubus’ Resistant would be quite useful (optionally, apply a Limitation to the Enhancement so it requires intimate contact of some sort).