On the bed spred out and face down buried in a pillow, then plow her ass.
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Spread eagle, tied to the four feet of a king size bed! Stuff a couple pillows under her belly to raise her ass up. Fuck her ass crack first. Grab her buns and squeeze hard as you pull them apart to form a trough for your cock. There should be enough sweat and pre-cum to lube up her anus. If not, just shoot a lougie or snot rocket. I doubt she has a virgin asshole but I would go in slow at first, inch by inch. When she starts thinking I'm a gentleman after all, that's when I'll start ramming my rock hard cock balls deep up her anal canal. Whatever shit is up in there break loose and mix with my cum to form some frothy shum which I will feed to her later. Too lazy to get up and go to a bathroom and piss, I'll give her a golden shower from her legs up to her hair.