Challenge Accepted! Who Will Fuck Their Step-Granddaughter First?

I wanted to do something special for both my step-granddads. They are always fighting for my attention, so I decided to throw them a party to show them how important they are to me. During the planning, everything backfired; they were arguing more than ever! I even noticed they were being extra affectionate and touchy with me, but I didn't read too much into it until they confessed they had a bet going to see could fuck me first! I know how weird that was, but I was horny, they are insanely hot, and we had 45 minutes before the party. I mean, what could be better to show them how special they are than an intense threesome?