At 8:45, Riley knows that he can get his fuck stick in nice and deep if he lifts one of Jak's hairy legs up like that. Going deep after licking that hole to loosen it up gets you the most bang for the fuck. Jak is one hot bottom.
The other guy would let go of that bitch. He can't pleasure him and tame his fire the way that I do. Every time he fucks him he feels emasculated for not doing the job right.