My sweet sister comforts me after ending the relationship with my girlfriend

My sister is very kind to me, she allowed me to stay at her house despite me being dumped by my girlfriend. On one of those sad days for me, I showed up very drunk and excited, to tell you the truth. She, in the middle of her sweet words, would provoke me due to the alcohol in my blood without realizing it, I touched her beautiful white breasts, and for some reason, she couldn’t resist. Although I tried, I couldn’t stop it, it was already too late for both of us. I touched her vagina and noticed it was very wet, and under the promise that it would be the first and last time this happened, she allowed me to fuck her.