Say: “I just can’t wait any longer; I’ve got to have that whole cock in my mouth.”
Lean in slowly, part your lips, and take his penis into your mouth, inch by delicious inch. Then, come back up his shaft just as carefully, pressing your lips into his cock and licking with your tongue. The point here is to get his entire cock wet with your saliva. Only do this once or twice, or you will have a mouth full of cum to deal with.