I remember that in the fic Kurt is forced to give Karofsky a blowjob, and when they are done Karofsky tells him not to vomit for 20 minutes. Kurt can´t hold on for that long and when he is done throwing up Santana and Brittany (I think) discovers him infront of the toilet. Santana sees what he has thrown up and helps him to the choir room where he can lie down.
I also remembers that no one is allowed to touch him while she goes to find Blaine.
Thank you in advance.
FOUND! Link in comments.