I was seduced by my wifes younger sister . It was 3 years before we got married . I was 18 . My wifes sister was 14 . My wife lived with her grandparent . It was more convenient for seeing me . Her parents lived 12 miles away . This is England . I had to catch 2 buses to get there . Every Saturdy . We went to her parrents house in the morning . Her and her mum went in to our city centre for the day . Shopping and looking round the shops . Going to Caffès . Then late in the afternoon they would go for a meal before coming back . Her father was at work from 6 am . Returning home after 7pm . I would stay in the house watching tv until they returned . Usually on my own . Then one week her sister was at home . We talked and watched tv . This is how it was for a few weeks . One week her sister did not come down from her bedoom until they had left . This week she was not wearing jeans as usual . She was wearing a dress . Not sitting with me on the sofa as she usually would . She sat in an arm chair , facing me . At first she just sat there watching tv . Then she sat with a leg over each chair arm . I could see up her dress . I could see her white panties and her crotch . I tried not to look at her . She stayed like that all the time . Every time i looked at her . My eyes were drawn to her crotch . The following week she sat like this , but she pulled her dress up exposing her stomach . Seeing her panties and her bare stomach gave me an erection . I sat with my legs crossed to hide it . The next week she sat with her legs like that . This time she “accidently” touched her crotch . Not just once but a few times . Another erection and sitting with my legs crossed . The following week she was actually rubbing her fingers on her crotch . This time i had to go to the toilet to relieve myself by masturbating . For another 2 weeks it was legs open and rub her crotch . With me needing to masturbate . Then she would pull her panties to the side . Giving me a look at her pussy . More masturbating . She knew what i was doing in the toilet . Going with a bulge in my shorts and coming back without it . Then she was pulling her panties to the side . Rubbing her pussy . I was almost cumming in my shorts . I masturbated in the toilet . I wanted to fuck her , but i knew it was wrong . The next week when she put her legs over the chair arms . She was no wearing any panties . I could see her pussy . It was hairy . When she started to rub it and push her fingers in to it . Pulling them out and sucking them . It was too much for me . I got on my knees in front of her to lick her pussy . Giving her an orgasm . Now i just wanted to fuck her . I took my shorts off . Got between her legs to fuck her . She had got me so excited i was soon cumming in her pussy . When i pulled out i realized what i had done . She could be pregnant . I kissed her . For the next few weeks we were both worried that she could be pregnant . Then she had her period . Every Saturday she stayed in her room until she saw my girlfriend and her mother . Get on the bus . Then she came downstairs naked . At first we fucked on the sofa . Then we spent the day on her bed . It was a 10 minute walk from the bus to the house . Each time we saw a bus . We watched in case they were getting off it . I used condoms to fuck her . When she told me she was on her period . It was a relief . Luckily i always had a supply of condoms . I used them for sex with her sister . For 2 years we had sex most Saturdays . Even when she had a boyfriend . Then me and my girlfriend got a flat with 2 bedrooms . Her sister asked if she could spend the weekend with us . From Friday night until Sunday night . Now when my girlfriend got on the bus to got to meet her mother . I got in bed with her and we had sex . Some Sunday mornings my girlfriend would visit her friend in the flats . She lived in a block facing us . We could see her flat from ours . When we saw her going in to the door . We had sex on the couch .