Nasty, nasty bird [nsfw-ish]

"CW:{A hint of dirty talk} 

When Enji thought he had seen and heard it all, Keigo pulled one more trick down his sleeve.

I enjoy some art with dirty talk, but making them is a different thing, here's me giving it a shy go 

What did Keigo whisper exactly? I know his filthy tongue can say the unspeakable😂