She grumbled but I promised to take us out for breakfast instead. We didn't leave until she had her suit-cases packed and everything ready to go. It w...s a late afternoon flight but we didn't know what we were going to do between breakfast and her flight so we took her luggage with us.At the restaurant we talked during our meal. "So did you two stay up much later after I went to bed?" No, Janice, not too much longer. We talked for a very little while but I sent Kay to bed and then got into bed. I looked up at her to see her laying there in bliss. Her robe was almost completely open and I had a clear view of her right breast with its large brown nipple pointing up in the air. She suddenly sat up and closed the top of her robe. She looked confused as she sat there quietly, while I waited for her to say something. I need to go now, she said with a bewildered look on her face as she couldnt believe what had just happened between her and her son. I took my hands off her legs as she stood. Next thing I knew my Mother-In-Law was astride me and had my now hard cock right inside her pussy! She started grinding me back and forth, making me ever so harder inside her.I said to her "this is wrong, but you feel so good and tight!"Caroline said "Donna and Bill are away to work now, so you're mine now. I know am bigger and an SSBBW but am top what you going to do?".I said "well roll you off me".To which Caroline my Mother-In-Law said "do you think so?", and promptly held my wrists down. Stroking Janes back, I could feel her moving against Ned in a languorous way. Her bottom rubbed against me but my cock remained limp and still dripping from our recent fucking. I fondled Jane's breast from behind and discovered her long, thin nipples were hard and lengthening. Then Jane raised her leg and I knew she was reaching for Ned’s cock.A few seconds later and she wriggled and dropped down and though I could not see, I knew his cock must now be sliding into her.They began to move.