She informed you about it a little in advance before making the announcement herself

"Oh my..." You whispered as your eyes go wide in shock after your sister-in-law dropped you the biggest bomb in your life.

She is pregnant. And the children in there are definitely the results of your affair with her back during the Thanksgiving.

"So... what are we going to do?!" You asked her in the whispering tone, hoping that she will have at least one plan already since she dropped such a bombshell like this on you a moment ago.

"Nothing. Your brother believed the kids in here are his. Yes, I told him a few days before." Your sister-in-law said confidently as she approached you sexily and even press her huge bosoms against your chest a little.

"Then... we have nothing to worry about? Also, why tell me?" You asked her back because you know that sooner or later, you will figured it out yourself that you are the father of the children in her belly since you were the last person who had sex with her that ended with a lot of semen being released into her pussy.

"You deserved to know. You are the real father of these two. And yes, you needed not to worry at all. I have everything under control." Your sister-in-law said before give you a little kiss on your left cheek.

After that, she parted her way from you by leaving you for the living room and join the others while also swaying her hips and making her gigantic breasts jiggle a little to entice you. Now, you are standing alone in shock in the very toilet where it all began a month ago back during the Thanksgiving.

Later at dinner, your sister-in-law and your brother announced that they are expecting new children together, resulting in everyone at the dining table, including you, to clap the hands and give them congratulations.

Once the announcement ended, you and the rest of your family begin to dive into the foods for tonight's Christmas Eve. And while you are eating your foods, your turned to look at your beautiful and busty sister-in-law on a few occasions with the thought of her belly is having two new lives in there as the results of you and her had an affair back then a month ago.

Many months later, your sister-in-law finally given birth to a pair of male twins. And lucky for you and your brother, they looked kind of like your brother in appearances.