Omg all I can think of is Gafou height difference headcanons. Like Lefou struggling to get something on a high shelf and Gaston just smirks and easily reaches up to get it. Lefou having to tug Gaston down for a kiss. Gaston holding something in his hand purposely out of reach and keeps saying "Come on Lefou, reach for it!" And Lefou just punches him to make him drop it. But also Gaston hugging him from behind and laying his chin on his head and is all cuddly and purring softly.