"If you don't have sex at your age, your vagina will get blocked." The lie from her brother triggered the naive sister to go on a rampage! Thinking it would be bad if it got blocked, she inserted her brother's dick on her own. Once the sister knew how good it felt, she didn't notice when her brother said "I'm gonna cum!" or "I'm already cumming inside!" She just kept pounding away in a frenzy! Completely ignoring the internal ejaculation, she paid no mind to the overflowing semen and only sped up her hip movements!
