I was thinking a scene at when Loki got his powers unexpectedly after being bitten by the vampire mistresses, he would feel and smell a scent of Thor. He eventually manipulates him, seduces him, and eventually drinks from him. After this, Thor tries to call to Loki before he eventually jumped out the window and flew away to the vampire castle for the first time. 

After that, Thor would have to go to the village where Liana was sleeping and beg her to help him on the quest to rescue his brother.