My girlfriend called me brother while having s$x

I 28m and my girlfriend 29f were in the middle of having sex. We were nearing climax when I went to grab her hand. She quickly clasped it pulled my arm toward her in the style of friendly hand shake. She brought it in and said, "hell yeah brother". I couldn't anymore. My erection died and well I felt like I just gave one the of the boys a good ole' bring it in pat on the back and go get beers handshake.

Had to tell somebody. Thanks reddit for listening to my misery