The first time Tiffany saw Taeyeon cry was when they went to visit a shelter together. It was not a sad occasion and it should not be, the shelter is a really nice place , quite secluded but it was all right. Tiffany and Taeyeon were looking at a black poodle, and Tiffany guessed Taeyeon found him too cute it was overwhelming, then Taeyeon started crying. Tiffany, amused, smiled looking at her girlfriend. 

In that moment Tiffany realized she could deny it all she want, she could push her feelings at the bottom of her heart or swallow all her words, nothing could make her feel like this.

Maybe she has always been in love with her. Maybe she fell for Taeyeon during one of their many arguments. Maybe she fell when she watched Taeyeon sleep. She did not know when she fell. Or maybe she just fell in love right at this moment. It was not important.

What matters is she is in love right now.