You've always been her desire but it could never happen before...now she's excited and won't let go of this opportunity to take advantage of you and (of course) your cock. She teases you, talks dirty to you, sucks you so good, gets creamy with you deep inside of her and she ends up exploding all over your cock. Admit it, you were also curious about your sis-in-law and jerked off to her a couple of times before.