My GF and I have a pretty normal sex life but there is a problem with my mum. First, I should say that I'm 23 and still living at home. My GF stays with us on weekends and she is pretty well part of the family. Mum is in her early fifties and separated from dad. The three of us get along quite well. But lately I noticed that mum has been jealous, especially when she hears June (my GF) and I making love. I have a bedroom in the basement and I guess the sound carries. June really surprised me - kind of shocked me - recently when she suggested that since my mum "hasn't had it" for long time that we include her when we have sex. We sort of make it a threesome. Then mum wouldn't have any reason to be jealous. June said, "We'll just include her one in a while". After talking about it for a long time, I agreed to it only because I knew that mum would be too embarrassed to agree.

Then a couple of weekends ago, June said she had spoken to mum and invited her as a threesome. Mum agreed to take part in what she called "an orgy" but ONLY ONCE and just to satisfy June. To make what is getting to be a long story shorter, the three of us closed the bedroom door (to keep the outside world out) and had kind of an orgy. June sucked me for a while and then rode my cock until I came. When it was mum's turn, both her and I were really uptight about doing it and I tried to play down the fact that it was kind of i****t. Mum didn't feel like sucking my cock (don't know why not) but just got on top of me and began stuffing my cock into her. Immediately, I could tell that mum's c**t was so dry. She said that she has not had sex for a long time. Maybe that was why. So I fucked her shallow for a while but as I began to get balls deep, she began to complain that I was getting "too deep". She said my cock was "hitting bottom", hitting her cervix, or something. This has never happened with June. We continued to fuck but every time I went really deep, it would seem to hurt her and she would complain. So I discovered fucking mum is not the same as fucking June. I am wondering if it is because mum is a small woman, or is it because she was so apprehensive about fucking me, her son. Maybe she is worried that it is i****t and kind of taboo. In the end, I was finally able to reach my climax and come inside mum but it wasn't so enjoyable. Fucking a woman is supposed to be enjoyable for both partners but it didn't work out that way. Anyways, mum said she would try it once. Well, I fucked mum once to satisfy June AND mum. So that is that. Whether or not mum will continue to be jealous of June and me, I don't know. But at least she has a little less reason to be jealous now that I have fucked her, too.