"If you don't have sex for a while, the hymen regenerates and the vagina gets blocked." The lie told by her brother triggered her ignorant sister to go on a rampage! Thinking it would be bad if it got blocked, she forcefully inserted her brother's dick. Once her sister knew the pleasure, even when her brother said "I'm gonna cum!" or "I've already come inside you!" she was too engrossed and didn't notice, just kept pounding away with wild thrusts! Completely ignoring the internal ejaculation, she paid no mind to the overflowing semen and only sped up her hip movements!
