The ancient lupus among the Children of Gaia beheld the “eternal heat†of humankind and realized that this ability could vastly increase their breeding capability as well as enhancing the pleasures of mating. In the present, as the blood thins more and more, homid women have employed it to increase the measure of wolf blood in the tribe. It allows a homid to bear lupus offspring and vice versa.
At the conclusion of the rite, the Garou spends a permanent Gnosis point, shapeshifts to match the form of the beloved one and approaches their intended. A homid mating in Lupus form must wait until the mating season, of course, but in all cases conception is guaranteed. The mother's breed form temporarily changes to that of her partner; the change lasts from conception to delivery, in order to prevent miscarriages. Metis, of course, cannot use this rite - and none would teach it to them.