Drain Kiss

Drain Kiss is a magical skill learnable from Rinny; it costs 6 MP for each use.

Rinny would always teach you that spell first, regardless of your stats.

Primal use
It can be used during combat to attack your enemies; note what it wouldn't have any effect on enemies immune to lust damage. It deals both physical and lust damage, with the former depending on your Mystic, and the latter on your Erotic stat.

Additional uses
After learning the spell, you may use it during certain scenes (assuming you have enough mana to cast it), either giving you additional scenes, or giving you the additional options to bypass the dangers.

The interrogation
See also: Serial pervert

During Arlene's interrogation scene, allows to try and kiss her. Wether it ends well or bad depends on your perspective, but it certainly would be memorable.

Infiltrating the farm
See also: Slavers

During infiltration, you may try to seduce a guard, then dispose of him; using the draining kiss spell on him would make it much easier, and provide you with unique scene, not available otherwise.

Revenge
See also: Manor quest, Edith

After finishing the Manor quest, you can visit Edith in her cell. If doing so with Rinny by your side, the option to get revenge on her would appear. If you know the spell, the option to use Double Drain Kiss on her would appear.