Square of red cloth
One thick red marker
One super thin permanent marker
Find a spot of earth that holds some personal connection to you and dig a shallow hole there.
Construct a sigil that morphs both your initials and your partners initials. Position them in such a way that the male's sigil portion is penetrating the female's sigil portion.
Draw this complete sigil in the center of the red cloth. Draw the female portion onto the egg with the thick marker and the male portion onto the nail with the thin marker.
Position the nail in the center of the drawn female sigil on the egg and thrust it inside without breaking the egg apart.
Wrap the egg with the red cloth and tie it closed. Bury the bundle in the hole you dug.