I want to fuck my girlfriends little sister

Okay, so im 20 years old and my girlfriend is 19. I love my girlfriend more than I can describe, we have the best connection and I see my self having a future with her. However, her younger sister was 14 when we first started dating, then she wasn't sexually attractive at all. but now shes just turned 16, shes become so, seductive and cares a lot about how sexy she looks, and how hot she is. Her tits are small, perky, and her body is slim and petite with a small but nice firm ass. She is really, really attractive to me, more probably because I know i can't fuck her. But sometimes when my girlfriend isn't around. She'll flash her ass to me by lifting up her gown, or look back and wink at me. Or, she'll take a naughty picture and ask me if she looks good in it. It sends me nuts. This one time my gf and I we're making out, and she was rubbing my crotch and her sister walked in, they have a very close relationship so theyre not fussed about intimacy and privacy to a certain level. And I had a huge boner ( my dick's 8.5" ) not bragging but it was very noticable as it was sticking down the side of my leg, my gf said to me "Leave it there! let her see!" and she sat next to me but me n my gf burst out laughing, and then she notices and said "you've got a boner!!" and my gf said to her "touch it" and her sister, in a very quick shy way touched it and withdrew her hand very quickly and giggled. This literally tortured me. also my gf often jokes about the two of them sucking me off, saying "oh we can share, you get one side and ill get the other, you'd love that wouldnl't you ben". I often masturbate over her at home, I own a fleshlight, and I fuck it while looking at pictures of her. It's a crazy lust, even when my gf gives me head I imagine its her sister. I feel awful, really awful.

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