Deep inside...

In her ovaries, the fresh hormones from the fertility pills are causing your cousin to expell a few eggs. The tiny golden orbs float gently down her tubes until they are assaulted by your invading maurauders. The little heads of your wrigglers are as tiny spears piercing the protective coatings of Lizzie's ovum turning them into zygote as they float gently down her tubes to implant in her now pliant and ready uterus.