go for the mom, every experience i've ever had dictates that the older ones have always been more straight forward and better because of experience in the bedroom, after that take a shot at the Brazilian Butt lift girl. i've been watching plastic surgery/cosmetic shows for years, quite interesting. also the mom seems like it'd be easier than the other chick. honestly if your relationship was so good you wouldnt be thinking about multiple others. all you've got to ask yourself is what are you gonna regret more not banging two hotties and going back to a girlfriend or absolute loyalty?