When I was about 16, Mom and Dad welcomed a recently-widowed old friend into our home – Dad especially was happy to have Betty, and her daughters Barbara and Beckie to come live with us. My dad immediately grew quite sexually attracted to Betty, while Barbara, who just a year oldwas about my age, took me under her wing somewhat, especially tutoring me in mathematics – she was very good at this while I was lousy, barely making Ds and Fs.
However, under the tutelage of Barbara – who I called Barbie – I actually became quite good at it. Of course, part of my attention to my work was because I in turn was attracted to Barbie. She was well-developed for her age, with lovely large boobs and a nice round bottom that pushed her shorts out nicely. She flaunted her tits around me quite often and might have even loosened up her bra straps a notch to ride a little lower – but I wasn’t really sure about that.