I'm not sure if it is the one you are looking for but Accidentally Funny by Kanna37 is a really good read and has a scene similar to the first you described in the first chapter.
Accidentally Funny by Kanna37
Sesshoumaru has joined up with the tachi - but Kagome really isn't prepared for the daiyoukai's twisted sense of humor. Who knew he even had one? Interrelated one-shots that will have no set updating schedule. Best Humor, Third Place, Second Quarter, Best Drabble, Second Place for Chapter one, Second Quarter. 1st Best Romance Other at the FA 1st Quarter 2011. 1st Best Humor/Parody Dokuga 1st Quarter 2011.
Rated
MAso no YIM's