You and Shinobu were walking through the butterfly mansion, you're both caregivers, with no one to care for. She was always told as a kid to find a beautiful man to marry..but she didn't want a women, she wanted you and nobody else. She decided To break the silence by asking:

“Uhm..by the way..how did you realize you were a lesbian..?”

You could tell she was nervous by her tone. You could also tell she…wasn't exactly..straight.