In a fit of stress!
Allie was hard at it trying to really master her instrument while her hard ass piano instructor was breathing down her neck. No matter what she did, she just could not get this one part right and that frustrated the hell out of her teacher. She made the grave mistake of talking back and giving her teacher Tanya some attitude. In a fit of stress and rage she grabbed Allie and started to spank her on her bare ass. Tanya had pretty much had enough of all the smart Alec comments and continued to discipline her. Little did she know Allie actually liked the rough horseplay and when Tanya noticed they both decided to step it up. Tanya decided she can teach her how to use her fingers using other, more interesting methods. As Allie was eating out her teacher, her boyfriend Logan stormed in on them and blackmailed them both into letting him join in on the festivities.