My BF and my brother

iI always wondered if my bf Andy was a bit gay cause of the way he behaves but now I know he’s bi. He came round to see me yesterday and I wasn’t home yet. It seems that when he arrived my brother (who IS gay) had just got out of the shower. They got talking and things started from there. Seeing my brother in his towel must have turned Andy on and they stared masturbating each other. That was when I got back and saw them on the couch together. My brother knew I was there and although I didn’t say a word, he starting sucking Andy’s cock. Andy was obviously enjoying it until he saw me watching them. He was all freaked out but I found it stimulating. In fact my pussy was so wet that I slid off my panties, pushed my brother away and sat on Andy’s cock and rode him till he shot his load inside me. My brother watched and was rubbing his cock so hard he came too. Afterwards I just got up and went to the kitchen to get a drink not saying a word.