I'm going to make you so weak in the knees ;)

Get on your knees to make up for me having to see your tiny dick.

Wonder if the guys at the office have jerked off to my tits on

On my knees and ready to serve some handjobs (OC)

on your knees ... open up ... stick that tongue out ... moan

If the knees buckle you're doing it right

This made my knees BUCKLE [OC]

This one made my knees BUCKLE [OC]

This made my knees BUCKLE [OC]

This one made my knees BUCKLE [OC]

This one made my knees buckle [OC]

A fantasy I didn't know I had [OC]