"Well, maybe she has a point," Barbie says with a sigh. Then unexpectedly, she raises her right arm to reveal her other tit. "Maybe I should learn all about sex and love, things that I denied myself after you dumped me...
You try to grunt out a "no" again. You know Barbie is naive, but this is seriously messed up. High School was a *long* time ago!
"You know, we used to share everything when we were little kids..."
You say "uh huh." You can't help admiring her lush body, but you are very embarrassed to have Barbie see your cock so hard...
"... until high school, that is. Then she never offered to share *you*..."