The fact that Aoife wasn't nervous (not 'boy-nervous') throughout this entire encounter, made her nervous. Of course, she liked it that with women there was never a need to worry if they wanted Aoife for her body. She knows that there's such a thing as bisexuality, but she's pretty sure she's not the type for those people.
So why was she still looking at April's body and wondering what she'd feel like? It was probably the siren, getting bored with her.

"I think it's time for me to go now."