Sis And I Share GF

It was my sisters girlfriend, and they asked me to get her pregnant. Not to be a sperm donor, as they didn't have all the money for that. Instead I fucked my sisters girlfriend. Now we both share her, sometimes together, sometimes separately. Sis and I have kissed when in a threesome, I've sucked her tits but that's all. Both are super hot, if the opportunity presents itself I'd fuck my sister too.