Creating realistic cleavage with fake breasts involves several techniques to enhance their appearance and achieve a natural look. First, adjust the positioning of your breast forms close together in order to create space between them for cleavage definition — experiment until you find the desired gap width that looks realistic for your body shape. You can also use special tapes designed specifically for creating cleavage; these tapes help lift and separate the breasts while offering subtle shaping. Another tip is to invest in a well-fitted push-up bra that matches your breast form size, as it can provide additional lift and support to accentuate the appearance of cleavage further. Lastly, choosing clothing styles that emphasize cleavage or plunge necklines can also contribute to creating an authentic-looking fake cleavage effect when combined with properly positioned breast forms.