I bet when thor and loki were going through puberty thor probably got a lot of awkward boners and loki thought it would be a good idea to say shit to get him aroused whenever fucking possible. like, “wow brother, sif’s bottom sure is looking perky tonight” and thor would just pop one. and he’d do it all the time, even during important political functions or family dinners. so thor tried to do it back, but loki was pretty resilient to it, unless thor actually touched him, then loki would go rigid. which means a good chunk of their teenage years were spent trying to give the other a hard on.