I'm attracted to my sister in law
I've been dating a girl for about 3 years. I spend alot of time at her parents home during weekends and holidays. I like my girlfriend, we have a normal relationship, we have normal sex.
Her sister is a year younger. I think she is alot more attractive than my girlfriend and I feel bad about thinking so. She is slim and very young looking and always wearing tight clothes and sexy makeup. I just think she is sexy sometimes!
I can't stop wanting to have sex with her. I fantazise about her alot, not everytime but quite often. I often fantasize about her when I masturbate or have sex with her sister (my girlfriend). I can't help having some feelings for her because she is around the house all the time. We practically live together.
What I feel worst about is that sometimes I snatch some of her dirty underwear and I masturbate with it to calm down some of these feelings. I think it feels great and I want more with her. This is the most perverted thing I do, aside from this I'm a normal guy, I've never had any fetish for underwear until just recently.