Sammy Braddy is close enough to being on her back, I'll allow it.
imgur.com category @likes_blowjobs
Lacey Banghard naked on her back, with a scarf (X-post /r/Lacey_Banghard)
imgur.com category @Chris_DK
SPECTACULAR girl, predominantly on her back (gallery in comments)
imgur.com category @likes_blowjobs
Busty Asian Camgirl Sasha Yamagucci Getting a Hard Fucking on Her Back
gfycat.com category @PM_ME_YOUR_ASIAN