Whose foot is that? (tip @ Alon M)

The scene in question is a threesome between Brandon Bangs, Shane Frost, and Tyler Andrews released last year by Hot House.

Dude_show_part_2_03 Dude_show_part_2_04
Dude_show_part_2_05 Dude_show_part_2_06

There seems to be a foot that is incredibly impossible to belong to either Brandon, Tyler or Shane.