Desperate to fuck my sis in law

I've always liked her but have had limited contact over the years. It all started one night I took her home. Nothing happened but she got out the car and said she loved me. I know she didn't literally mean it but I kick myself as it feels like a missed opportunity.

Roll on a few years and she was pregnant and now dropped. I see her much more often and I get so aroused every time I see her. She has put in the baby weight and her tits are fucking massive for a short girl. She's always walking about barefoot and I just Wana bend her over and empty my balls inside her.

I don't her the impression that she's very dirty and I think she'd struggle with me in her little mouth.

I know it's wrong and that's why I think I want her so bad. What should I do to test the water?