I had a hot gay dream involving my husband? WTF?

Sounds like you answered your own question. If you guys fooled around before you went ot bed and you were watching him moved around, you were probably just extra turned on. It was only a dream, it sounds kinda ! Maybe somewhere in the back of your mind, you might want to watch two guys together. If that is the case then it seems logical that one of those men would be your husband in a dream.