Female
Blaine was not prepared to living with females.
Oh, and he'd thought Kurt was joking when he- very sternly- warned him.
It started with tampons in the bathroom cabinet.
He could deal with that. He just didn't look at them too much, and tried to avoid thinking about how they're used whenever he saw them.
Then, there was a ball of toilet paper in the trash can. He didn't need to see the string coming out of it to know what it was. Oh god. It had been in... and it was full of blood... He rushed out of the bathroom and didn't shave that morning.
The next thing was bras. Bras and panties. All over the apartment. Rachel only had them hanging in weird places around the bathroom, but Santana had them all over the place. He's already found a pair of panties between the couch cushions, only to ran away screaming to Sam's apartment.
What crossed the line, though, was...
"Boobs!" Blaine slapped a hand over his eyes, but the image of Rachel sitting on her bed shirtless was not going away. "I'm sorry!" he yelled, fleeting as fast as possible.
He waited in a blanket pile in their bed until Kurt came home.
"Blaine? Are you okay?" Kurt asked, concerned as he sat down on the bed next to him.
Blaine shook his head, looking up at Kurt with wide eyes. "I saw Rachel's boobs."
Kurt snorted.
"It's not funny! I don't know how you've been dealing with it for a whole year. Tampons and bras and panties and boobs... I'm traumatized."
"Good news is that you get used to it after a while," Kurt said as he got under the blankets and lay back. "C'mon. I'll cuddle you until you feel better." He opened his arms and Blaine sighed and let himself fall into them.
"Just please, make them go away so we can have uninterrupted sex tonight. I need to feel not violated."