Make it a friendship thing between people who appreciate territoriality, a size kink thing where Thor can hold Matt up against the wall with one hand while undoing his shirt with the other, a cute pre-slash thing where they bond over packaged food because Matt appreciates their familiarity in oversensitive ways and Thor just really likes Pop Tarts, a wider Avengers crossover where Matt and Thor get left behind together a bit too often and the others are totally trying to set them up, or literally anything else.

I've noticed that Thor seems to get left out of crossovers and that saddens me.