Howdy,
Not taking anything away from the annointed (sic) titfuck supervixens Tiffany Towers and Lisa Lipps, but IMHO one of the hottest TF scenes of all time is between Kimberly Kupps and Tom Byron in a little production called "Bra Busters 1" (LBO productions 1993, in case anyone cares).
Kimberly is lookin' plush and sexy in that classic porn Big Hair 80's kinda way and is poured into a very tight pink bustier w/ black stockings and requisite stilletos.
She and the lucky Tom muck around before getting down to the good stuff in an unforgettable scene: tight shot of baby oil bottle, squishy TFing sounds off-camera and KK moaning "Oooo yeah!... fuck my big tits..." etc. Camera pans up to KK, huge boobs squeezing out of bustier, back arched as she offers her greasy globes to TB who is pounding his prick between them.
Maybe it's the voyeuristic opening shot of the oil, maybe it's KK's enthusiastic moans, maybe it's the bursting bustier... but it gets me every time. Anyone else seen this one?