Can't divorce your sister

Short story, I was between girlfriends and with work requirements stopping me from finding another. Only female available was my sister low self-esteem due to being dumped again. As she was around me and I was horny I seduce her, two reasons mainly the main one I was horny, and she was close by. The second it would boost her self-esteem maybe, but she got pregnant instead. On the bright side I've regular fuck on hand every day, plus a healthy son.