She carried you a pair of twins but your brother believed they are his

It had been a month already ever since that incident between you and your sister-in-law. Now, it's the holidays' season and she said that she has a surprise for everyone to hear during the Christmas dinner.

"I'm pregnant!" Your sister-in-law proudly announced as she's showing everyone the pregnancy test that shown the positive sign on it.

After that, your mind raced back to that incident at the toilet between you and her a month ago. Of course, she is definitely going to get pregnant due to amount of semen you released into her womb!

Once the announcement ended, everyone clapped their hands and congratulate her for this pregnancy while her children are happy that they will have more siblings. After the congratulations for her pregnancy ended, everyone begins to enjoy the dinner on the Christmas night.

And eight months later after the announcement of her pregnancy, your sister-in-law given birth to a pair of beautiful girls!

As you brother is looking at them with a smile with the complete belief that he is the father, you know otherwise. After all, you were the one who put the twins into her belly. And such an incident and the birthed of the female twins ultimately happened because you just wanted to see her gigantic tits!