Getting Caught Fucking .

My girlfriends 14 year old sister seduced me . When i was 18 . I stayed in the house with her . When my girlfriend and her mother went in to the city shopping on Saturday . They looked round the stores . They met up with friends . Going to cafe's and in the evening before coming home . They all went for a meal . Her sister was always using a dress . At first she only sat in an arm chair . With a leg over each arm . Showing me her white cotton knickers . Then it was her sitting like that touching between her legs and rubbing her pussy . Making her knickers wet . Every Saturday i had to wank in the toilet . To relieve me . Then one week she was pulling her knickers to one side to rub her pussy . Finally she was not wearing knicker . She rubbed her pussy and pushed 3 fingers in to it . When she pulled them out . She showed me her fingers . I could see how wet they were with pussy juices . When she put them in her mouth and sucked them . It was too much for me . I went over to her . Kneeling down to lick her pussy . This gave her an orgasm . I took off my jeans and fucked her . Cumming in her pussy . I was so excited . It was only later that i realised thar i could have made her pregnant . For a month i worried about it . Making sure to use condoms . One Saturday my wifes mother had forgotten somthing . My wife said she would come back to collect it . Leaving her mother having tea with her friends . We never locked the door . I was fucking her sister on the sofa when she walked in on us . To make it wors i was cumming . I expcted her to explode with anger . I think she was too shocked . She asked how long it had been going on . I told her it was the first time . She knew i was lying . If i told her the truth . She might forgive me . When i told her we had fucked every Saturday . She told me a secret . Her and her sister slept together and had sex . I wanted her to make an excuse not to go with her mother Next Saturday . She lied saying she was not feeling well . We had sex on the bed . They licked each other having orgasms . I fucked them both . Then fucking my girlfriend and cumming in her pussy . She was taking contracepion . As soon as we could . Me and my girlfriend got a small 2 bed apartment together . Inviting her sister to stay at the weekends . So we could all have sex .