My bestfriends sister

I have been trying for over a week to get my friends sister in the sack. She said she was ready to fuck tonight but she had to go get some pain shots in her back and didn't feel like it today. She is definitely ready to fuck because I point blank asked her and she wants to just gotta wait till she is not hurting anymore. Then I'm going to eat and fuck her till she s screams with ecstasy or that she can't take it begging me to stop.