The gag is more brutal when wearing a tight posture collar (X-Post /r/BondageGIFS_HighRES)
gfycat.com category @VeryTied
imgur.com category @IdrisArslanian
imgur.com category @patpowers1995
Katie collared and wearing ballet boots (XPost from r/KatieThornton)
imgur.com category @NeedMoarBoobs
Asian girl wearing a collar and getting fucked by a white cock [mf][wmaf]
tumblr.com category @inferiorasian