Kiss Spell (Metamagic)
The witch can administer spells requiring a touch attack with greater power through a kiss.
Liber Mysterium
The Netbook of Witches and WarlocksBy Timothy S. Brannan and The Netbook of Witches and Warlocks Team
Prerequisite: Able to cast 2nd level Arcane Spells.
Benefit: Only a spell that targets a single living target and requires a saving throw can be used as a kiss spell. The normal touch attack becomes a kiss. Any spell that is applied with a kiss raises the DC of the saving throw by 6. Doing so renders the spell useless in combat situations.
Like most metamagic feats a spell must be prepared as a kiss spell in advance. A kiss spell must be prepared at one spell slot higher than normal.
A spell delivered through a kiss can also be empowered, as described in the feat Empower Spell or it can be cast as a heightened spell of 2 levels higher. It can be stacked with any other appropriate metamagic feat.