I know it's a weird question, but i really need to know, if a boy sucks your boobs hard enough, is there milk?

My friend is 16, and her and her boyfriend didn't have sex or anything, she told me she removed her top and bra, and let her boyfriend rub, squeeze, and suck her boobs, I know it's a graphical image, but she said milk started coming out her boobs, she's never had sex in her life, so she can't be pregnant, so is it true when a guy or any person sucks your boobs hard enough, will milk come out?