Sneaky Sex

My parents are big drinkers and always going to parties or having parties. I'm not a big partyer and rarely drink to excess. I prefer to stay in my room during their parties and study as best I can with the noise of the party. I'm going to university and at 21 was still a virgin, but after seeing my parent's guests at their last Christmas party. All drunk and passed out, I thought I was smart avoiding the party. But I saw one of the guests with her top undone and got my first close look at a real boob. But it was too late to do anything as they were starting to stir. Lucky for me my parents had a new year eve party also and the same woman about 50 or so was there also drinking heavily. I stayed in my room but waited until it went quiet and went to have a look around. The same crowd as at the Christmas party were again laying everywhere passed out again. I found the lady and opened her top and played with her boobs. As she didn't react, I got bolder and removed her panties and played with her pussy. Still no reaction, so as I had a hard-on, I fucked her. She didn't wake and I redressed her and went back to my room. Every time since I follower the same process and have fucked the woman twice. But things change and at the last party the woman was doing the usual thing at the party, I got some food and went back to my room. Short time later my door opened, the woman entered and straight asked me for sex. She said she started getting horny at my parent's parties and as most of the men at the party were either married, attached or gay and their partners were also at the party. She saw me and decided to see if I would hopefully satisfy her. You could've knocked over with a feather, I got an instant hard-on agreed on the spot. She didn't get as drunk this time as she was in my bed the whole night. She taught me a great deal and I've started to see her at her home on weekends and after lectures. If she does know I've fucked her she hasn't said and she is milf.