Opps Wtf Did I Do

I just turned 21 I'm staying with my older 28 sister for a week.
And yeah I just fucked her husband in there daughters room on her bed.
He is 29 sexy af And I've been curious for years.
We had a one night stand kinda opps on my 21st but we clicked together like magnets on accident and I let him use me for hours not just sex but he fully used me
I feel fully satisfied and feel like guilty shit.
But if he wanted me again I would open my legs and pussy for him