Would you be weirded out?

Okay so I'm friends with benefits with this guy for about 2 months now. Then suddenly after doing it he asked me, "Do you want me to introduce you to my brother? He's a good guy he could be interested in you too"

And I was like ???

Although I have zero feelings for him I just feel weird being with his brother. Would you think this is weird as well? Would you offer your sister to your fwb?