My friends Mom

We used to party every wednesday night at a friends place. I was out of town over the weekend and nobody told me that the coming wednesday night we will not be having a party since our friend is going to her step brothers wedding. I reached her place by 9 pm as we used to do every wednesday. Her mom opened the door and I was surprised cuz generally my friend used to open the door. She welcomed me and made me sit in the living room and she left rite away before I asked her anything. She came back in 5 minutes and asked me if I can help her with something in her room. I said surely. I went to her room and she said I am sorry to say but I am in great pain and if I can help her by rubbing her herbal oil on her back. I wanted to say no but she made such a face that I was unable to say no. I asked her that where is everybody and she lied that they will be back in a little bit. She laid on her bed and rolled her night gown half way down so that I can rub the oil on her back. As I was rubbing her back she kept pushing the gown down and I was almost close to her ass and she said don't be shy it help relieve my pain and keep going after a while she said please take a side and I thought she will be putting her gown back but it was not the case she turned around and I could see her completely naked and her facial impressions suggested as if nothing is wrong and she said could you please help me by rubbing a little bit of oil around my neck. At this point I got confused and wanted to walk away and I guess she knew my intentions and she stood up and sat rite next to me and said dont worry, if you are uncomfortable I can sit and now you can do it, while I was doing it, she came so close to me that I can feel her breath. She kept bringing her face closer to me but I resisted and didn't do nothing. After a while I said you must be feeling fine now and I should better be leaving and I will join my friends in a little bit. She said please don't do that I will feel bad if you will leave like that and pushed me slowly on the bad and said I also owe you a massage now. she started unbuttoning my shirt and I said I am fine and I don't need that but she insisted that don't be shy I am like your friend as well and you can trust me and I will not tell anybody about it. I was not comfortable with that at that point but I was undecisive about what to do. She kept rolling her fingers around my chest and after a while took off my shirt by this time I was completely under her control. she turned me around and gave me a really good massage. Mean while I started feeling her boobs rubbing on my back. She told me to turn around and started kissing me. At this point I couldn't resist. She played with me for an hour and told me that if I will not come again she will inform my parents that I came at her place in her husbands absence and tried to harass her. I went back to her a number of times. Initially I used to be scared but later I found it to be fun. Through her I came to know a couple of her friends who were bi and thats how my curiosity for three some encouraged and I loved having threesome.It all started with her keeness to have sex with a young guy but I found this lifestyle because of her and now I enjoy it. The only difference between her and me is, she dragged me into this but I only do it with people who are willing and interested in doing this. I was 21 at that time and I guess she was in her late 40's. Since I enjoy this I want to explore more with people of same interest but with there willingness because that is easier and convenient for healthy and safe life.