HomeWrecking Sister

My brother's house is being fumigated for termites and he cannot stay at his house. His wife is staying with her family but he can't stand them so he asked Mom if he could crash at our place. I have been at college and did not know about any of this; I come home to my brother in my bed. Hes sleeping and drooling all over my pillows! I shake him to wake him up and he tells me what is going on. I can't believe Mom didn't tell me and he is staying in my room! He tells me to sleep on the couch and I tell him he's crazy. I tell him to sleep on the couch but Mom already promised him my room.
I tell him the bed is big enough for both of us since it's a king size bed. My brother looks around and agrees with me. I sit down next to him and he starts telling me about how him and his wife are having problems. I feel so bad for my brother because he's a great guy and loves his wife. But lately she has been treating him like and not pleasing him. I cant believe that ugly bitch wont take care of my brother. I know I can do a better job; Im sexy-petite and just my brother's type. I start touching him and he pushes me away explaining to me that he's married. I tell him about how I can please him since his wife can't do her job; my brother is furious that I am trying to come on to him, I mean come on I'm his sister. It wouldn't REALLY be cheating since he's keeping it in the family.
He starts to realize how hot I am and how my body is way better than his wife's and how much he misses fucking a pussy. I start sucking his cock and he can't believe how good I am at it. Since his wife is boring and never has sex with him and when they do its boring vanilla sex; I bend over and let him fuck me doggy-style. I beg him to cum in my tight wet pussy. I love the big load he gave me! Now we must clean up fast so that mom doesn't catch us. The last thing we need is her finding us and telling my brother's wife!