I'm straight, so my opinion should be taken with a grain of salt, but I did take a peek at your slixa as well as sexyliveduo website.  When I did I noticed a few things that might have slanted your experience.

First, on both sites it makes reference that Talia is bi, but Armando's profile is "Straight, but friendly to everyone", which to me means he's ok with a man being in the bed, but doesn't necessarily invite intimacy directly with men, which would definitely cross off double teaming him.  

Second, both websites feature mostly pictures of Talia (especially in the gallery), but not Armando, so if I was to be drawn into engaging the services it would be mostly with her in mind