Stiles was beyond happy that Derek was there to take him away but he was also sad because he was leaving Alison. He knew if he screwed up and upset Derek again that Alison would be punished for it but that didn't mean she wouldn't be forced to do things she didn't like in the mean time.
Stiles silently got to his feet, keep his head bowed, as Derek made the move to leave Eterna's home. Stiles wanted to look back at Alison but didn't because he knew he would say or do something stupid if he saw her at Eterna's feet.