Oath of Pleasure
'Oath of Pleasure is a nymphomancy spell described in Monster Girl Encyclopedia World Guide III: Sabbath Grimoire.
Guide Book Entry[edit | edit source]
A defensive spell that blocks out everything other than pleasure. By creating a special mana membrane and draping one's body in it, it blocks out shock and pain other than pleasure, but, on the other hand, it extremely reduces resistance to pleasure. The invisible mana membrane prevents mutual harm. When weapon or spell attacks are inflicted upon an inma draped in this membrane, it definitely feels as if they hit the mark and not as though they were interrupted or deflected by anything, and yet regardless, not a single wound can be inflicted on the inma. On the other hand, since attacks and spells that inflict pain or shock made by the caster herself are also nullified, she will also be unable to harm anyone.
This incomparably powerful defensive spell is predicated upon a strong oath to abandon all resistance towards sexual pleasure in exchange for absolute defense against pain and shock. The mana membrane doesn't let attacks through, but when the caster receives pleasure, the mana of the defensive membrane dissipates, and it comes off. The effect of this spell is empowered by means of an “oath” to sacrifice something in exchange for something else, but even if an inma becomes more sensitive to pleasure dealt to her, all that does is make her enjoy sex even more. In the age of the former mamono lords, it was prevalent as a powerful spell that compelled men to have sex with inma. It's not impossible to magically dispel the defensive membrane, but “spell break” is nonetheless mostly ineffective against inma, since they are a race that possesses ample mana, so dispelling it is not very realistic. For that reason, when men encountered inma during battles between humans and monsters in the age of the former mamono lords, they would flee at the sight of them, or, for instance, leave them be after neutralizing them with spells that don't cause pain, shock, etc. such as sleep inducing spells and so on. It is said that of all the monsters, inma had an extremely low mortality rate because they were mostly dealt with by avoiding fighting them.
This spell provides powerful defense, but on the other hand, abandoning resistance to pleasure is, in other words, tantamount to leaving oneself completely unable to resist any pleasure given to her by a man, mentally or physically. If a man reaches towards the caster not to attack, but to pleasure her, and fondles her all over her body, the pleasure dealt will be as though it practically pierces the very core of the caster's body, easily leading to climax. Also, it's not just the body that loses resistance towards pleasure. If a man assaults the caster, determined not to defeat her, but to make her his female, unable to resist the pleasure provided, the caster's heart will easily yield, and she'll acknowledge herself as belonging to the man. However, in the case that the caster is a married monster, it's another story. Monsters who already have a husband are unable to recognize any other man as a male and by their very nature are unable to even experience pleasure from doing it with other men no matter how low their pleasure resistance drops. Thus, it is impossible to break through this spell's defense with pleasure that never existed in the first place, and as a matter of fact, the only man capable of providing pleasure that could break the spell would be the caster's husband.
Furthermore, the “pleasure” that the caster loses resistance to is not just that which is directly brought about by erogenous sensations from sex and fondling. She also loses resistance to the “pleasure” induced when her husband's lust is directed towards her and she's pursued sexually, when her husband is pleased by the pleasure she provides him, and so on. In other words, even without having sex, even the “joy” she experiences just from being with her beloved spouse will be irresistible. A demon general who used to be known for being highly capable and having a stern personality boasted with great enthusiasm, “I will dominate everything from his body to even his very soul,” when headed to face the human man who was her rival in a decisive battle, but as a result of having used “oath of pleasure” during the battle, she has become completely subservient to the hero who ended up as her husband, and is now madly in love with him. She used to be stern and overbearing even towards men, but now there's not even a trace of her former self. She's unable to hold back the slackened smile that seemingly indicates that she's happy from the bottom of her heart just from being beside her husband, and they say that when the two exchange words, she can't help but dote on him because she loves him so dearly.
Additionally, the “protective mana” that presently safeguards men so that they don't get injured from sex that's too rough, or the monster's claws, horns, etc., the spell that all monsters are endowed with by their very nature that is constantly in effect, is thought to be originally derived from this spell.
“A contract between a man and a woman doesn't need such a distasteful thing. What we exchange, what burns us, is only this pleasure... For now, just indulge in me to your heart's content.“
~the demon general back when she still had her dignity intact~