Your sister-in-law is your weakness. You just can't say no to fucking your brothers wife. Now she's heavily pregnant, and it's most likely yours! As your SIL said, your brother just doesn't have it in him to get her knocked up. She confesses how she can't get enough of your cock and hopes that you'll keep breeding her behind your brothers back. You make her work hard riding your cock for a creampie. She's willing to take the risk of having your seed dripping down her thighs when her husband gets home. She begs and screams for more and you do not disappoint.