Alexander Volkov is the sub. There's another full length scene between him and Sergeant Miles you should look up. I'm not a "flip fuck" fan, but they both have big dicks and really tight assholes, and they fuck the snot out of each other. Real good jack off material. If you don't cum watching Sergeant Miles take that fat Russian dick in his tight little butthole, I'll give you a dollar.
I gotta say, if that ass was up in the air and his hole was staring at me at around the 6:20 time frame in this clip I'd have to lick that entire ass, hole, and balls before I put it in. Forget the dildos and sex toys.