My wife and I had a decent enough win on the lottery nothing big but enough to pay our mortgage off and invest in another property that cam on the market in our road. We are friends with a younger mum at the school who was facing loosing her current home as the landlord wanted to sell. We decided that we would offer this mum the chance to live in this house for a substantially reduced rent. Our daughters were best mates at school and also shared the same birth date so it was a win all round situation. I've turned 50 in the last year my wife still in her 40's for a while yet this young mum Anna is 17 yrs younger then myself and I often tease her about being young enough to be my daughter. In our chats in the playground I know she has a filthy mind and sex is never far from something a group of us tease and joke about all be it using subtle remarks . Anna is around 5ft 6 tall a size 10/12 and a decent enough bust that I get the odd glimpse off in the warmer days when she bends down in front of me. As I work shifts I'm around a lot during the day time Anna doesnt work but is supported by the children's father although they are no longer together. One morning after the school run she asked me in for a coffee nothing unusual there , we sat there chatting her bitching away about her ex then moaning about lack of money etc. She said she would always be grateful to us for supporting her and keeping a roof over her head.I said its no problem its an investment for us and aslong as she pays the bills. As I've said conversations have never been shy and she went on to moan that she was hoping to see a fellow dad from the school this weekend who works for the emergency service and joked how he might help her to revive her sex life. I joked with her saying that I hoped it wouldnt be too noisy and I wouldnt mind being a fly on the wall. You'd like that wouldnt you she replied. You have no idea what I really like I said back to her. Go on then surprise me she said. I hesitated I wasnt sure on how far to go with letting my inner secrets out. She laughed at me and said I knew you are all talk. Its not that I said but I think even you would be shocked at the things I tell you. I aint no prude you know that she said to me. Ok then I said but you dont breve a word to the others at the school this stays inside these 4 walls . If I say anything you can kick me out she said. I knew with that statement I had her trust and she mine. Ok then I said knickers . Pardon she said. Knickers pantys call them what you want but I like them. What to wear she asked. No I like to sniff them. The warmer the better I said I'm often grabbing my wifes in the morning. What do you do to them she said . Wank I said the smell is a massive turn on to me and I love to lick them as well. She didnt look shocked . I've never had a man want to do that with mine before she said mind you who would want the ones I wear all old baggy and faded. I would I said to be honest I've had a few wanks thinking of you in the past. Only when wanking while sniffing pantys I said. The conversation paused only to be broken by Anna saying she needed the loo. She returned to the room sat down and said Would you do something for me. What ? Show me what you do to them. Now? Why not she replied. You can have these she said and tossed a pair over to me! I picked them up looked inside to see the gusset damp my cock starting to stir I lifted them to my nose and inhaled the aroma of the dampness pee I thought to myself. Fresh and warm mmm I murmured I ran my tongue over the gusset in them sticky aswell. I looked over at Anna she sat there starting at me but her hand hand dropped to between her legs.Is that all you are going to do in them she asked. So I took off my jeans and got out of my shorts my cock standing up proudly . I heard Anna gasp a little. I've not seen one as fat as that before she said. How big is it. I said its a good 6" around and the same long. I resumed my fun with her pantys and started to freely stroke my cock with Anna watching her hand now inside her jeggings rubbing herself watching me enjoying myself. This was quiet a turn on playing in front of someone I've wanked about in the past and seeing her play with herself in front of me.He eyes were fixed on my cock as my hand worked up n down pleasuring myself. Suddenly she stopped and looked directly into my eyes and said I'm fucking horny now looking at that I know its wrong of me but I want to feel that fat thing in me can I sit on it. My wicked mind just said carry on. Anna stood up removed her jeggins and came over to me come here and lay on the floor.I did as she asked looking up between her legs to see she trimmed but not shaven her lips pouting at me . She lowered herself on to me, Fuck she hissed as she gradually lowers herself my cock sliding into her wanting hole. She rested there getting used to the feeling. I've never felt so full before she said. How does your Mrs take it she asked. She doesnt I said its a a case of me wanking the tip over her but I dont get to fuck her fully. Silly cow Anna said I fucking love the size of this I fell very full.She started to rise and fall on me her pussy coating me in her cum helping it to slide in and out of her easily her moaning gradually increased I started to try and match her raising and falling on to me so my cock would feel like it was slamming in to her.Her face was red from the build up of pleasure she soon let it all go and not a scream but a definite cry of enjoyment as she came on me. I followed suit not to long afterwards with my cock cumming inside her. She partly collapsed on to me her head nestled in the side of mine. Tears started to run from her eyes .I feel mean for doing this to you and her both of you my friends Shh I said as I kissed the side of her face kissing her tears away. My cock softened and slid out of her. I have another surprise for you I said and made her roll off me on to her back I got between her legs and slide my tongue in to her spunk filled pussy and began to clean her up licking up all our juices. My god she said there aint many men who would do that! After we had both made ourselves decent we sat back down to chat Anna saying she would love to feel my cock inside her again its so much better then the toys I have . I looked at her and said maybe we can come to an arrangement . You can have this cock but if I keep using the front door everyone in the street will talk luckily for us there is a back lane to her house. I've got a few more things I'd like to show you I said.