[ That... is the best thing omg. Naoto makes another pleased noise to affirm he heard!

He's still going slowly and very carefully when he takes more of it into his mouth, exploring every single part thoroughly with his tongue as he does. It's important information to have. The fingers of his free hand meanwhile ghost over all the parts of Sion's cock that aren't currently actually inside Naoto's mouth. Shh shh it's okay you'll get your turn. ]