After Rimuru and Frey's minor disagreement about how to address eachother. Guy Crimson decided to make a tease on Rimuru since his weakness is 'Beautiful Adult Women'.

Guy: "I would turn into a women to get something from you and avoid rejection~."

Diablo decided to mock Guy.

Diablo: "Rimuru sama wouldn't be interested because im already the secetary and would also turn to a woman if wished."