I dont understand why kevin was going crazy over his teacher in that episode ???

https://www.youtube.com/watch?v=n3eJkf4erbI
https://www.youtube.com/watch?v=n3eJkf4erbI
https://www.youtube.com/watch?v=n3eJkf4erbI

Yeah she was only 27 or 28 young and nice