That looks nothing like Nicki. She's light-skinned and this person seems like they're a darker complexion than hers despite the flash.... and those struggle curtains. I don't think it's her at all. I know she can be a lil "out there" but this is basically a naked picture and I don't think she'd let him do that.
EDIT: and the caption is just a dead giveaway too. ew. Men are such trash when they can't handle a fight/break-up. Ready to throw d**k up into any lil Michelle to push somebody's buttons. over it