Humiliating Lost Bet to Girlfriends Hot Domme Friend

My girlfriend's hot friend is always teasing me when she comes over. Usually, wearing sexy outfits and trying to get me in trouble when she catches me looking. Last time she was over she offered to make a bet with me. Loser would get a bare bottom spanking over the winner's lap, and they could even record it if they wanted! I should have been more skeptical about the bet, but I was too busy thinking about her helpless over my lap to realize that it was too good to be true! What I thought was a surefire thing resulted in me getting a HARD hand spanking over her lap. And if I don't let her spank me every week, she'll show all of our friends the results of our bet. At least a beautiful woman like her won't be too mean. Right?