My (28F) boyfriend (31M) invited his cousin (30F) to spend a night with us. I didn’t know she was going to be naked the whole time.

My boyfriend and I have been together for almost 3 years. He has a cousin who he has been friends with since they were kids. She had to move to a different country for work but never lost contact. Since she had to travel to our country for work she accepted my boyfriend’s invitation to spend a night at our place. <br><br>She arrived yesterday. I liked her immediately and was excited to get to know her better. For the first hour she was dressed but after she changed into something more comfortable for the night. <br><br>Something that I didn’t know was that she was going to be topless for the whole night. I was going to work the next day so I went to bed earlier. She was still awake when I went to bed and I felt uncomfortable when my boyfriend hugged and kissed her good night. <br><br>I’m confused. He’s never told me anything about their family’s traditions. I’ve met his family twice before. They’ve always been nice and respectful towards me. <br><br>Should I talk to him tomorrow about it? <br><br>**Edit:** She’s his half-sister by father.