Wife Gave Me A "special" Christmas Gift

This year we decided not to do anything for each other. We bought a house and had to do a few things to it for it to be move in ready. So Christmas was more for others this year. My wife kept joking she was going to give me something special this year anyway and I expected the Christmas day fuck. Instead when i got home from work on Christmas Eve my wife was waiting at the door wearing some sexy outfit and said that wasn't it. She lead me to the bedroom and told me to open the door. When I did I saw my sister in law, just a bit older than us laying on the bed in some very sexy lingerie. My wife said Merry Christmas and pushed me onto the bed. Instead of joining she sat in a chair in the corner and started to play with herself and said she just wanted to watch. Her sister took initiative and crawled on top on me, rubbing me all over and finally pulling out my cock and putting it in her mouth. She said she's wanted this since we met and was so turned on it was finally happening. She gave me amazing head (and surprised my wife and I when she started to use her tongue on my ass for a bit) before climbing on top and riding me. It didn't take long for me to hear my wife cumming in the corner. This turned me on and I threw her sister down and did everything I'd been wanting to. Ate her out, licked her ass, fucked her from behind, on top, reverse cowgirl. All the while my wife kept fingering herself. After about a half hour I told her I was going to cum. She told me to cum on her face and in her mouth. She got on her knees and helped drain me on her face and on her tongue before she swallowed what she could. We all laid on the bed and kept touching each other. After a bit I said I'd be down for another round. My wife said she would have me tomorrow and that her sister was my present. Without any more prodding her sister put me back in her mouth. Another great blowjob later and I was cumming again in her mouth before I pulled her on top and ate her out while she sat on my face. We fucked two more times that night, the last time finally getting her to do anal which she went crazy for. Before she left the next morning she said she wanted to do this again and that she had a birthday coming up soon before winking. Safe to say I don't think this will be the last time.