"Even if you're a virgin, using a toy for masturbation will make you frigid." The lie from her brother triggered the ignorant sister's rampage! If it stops working, that would be bad, so she loses her virginity on her brother's dick! Now that the sister knows how good it feels, even if her brother says "I'm gonna cum!" she'll say "You're already cumming inside me!" "Even if you say that, I didn't notice because I was so into it! Completely ignoring the internal ejaculation, I didn't care about the semen overflowing and just kept accelerating my hip movements!
