Cousins in Love (SaTzu)

Two only cousins having their mothers being sisters who's married to a Japanese and the other Taiwanese. Both are very close like inseparable sisters.

The catch is they like each other more than cousins should.

How should they cope up with their feelings-happiness, sadness, anger, and even jealousy.

Should they follow their heart? Or, should they keep it to themselves knowing that both of them are cousins, and worst their parents don't like gays and lesbians.