[Bounci]

Not my ex gf, but what the video was called where I found it. It's short, but sweet, and shows a skinny girlfriend on all fours being shagged from behind. And it's clear from how the camera is positioned - as well as the fact when the boyfriend leans forward the top half of the screen blanks out - that the young lady has no idea her most intimate moments, as well as her body, is being all captured on film for rewatching again and again. He even pulls her top knot just so the camera can get a good look at her face, to make sure there's no mistake who is being ridden here, then leaves her panting with bum in the air after bringing her to orgasm.