Singing blowjob (NSFW)

One of my friends was a sailor in the navy many moons ago. He was out on deployment for long periods of time, and being a ship without women, he was naturally frisky.

They arrived at an island to resupply and the crew were given leave - so he makes his way to the nearest tavern and enquires of the barmaid

'Where can I find a brothel around here?'

To which the barmaid replies

"I'm afraid you won't find any such establishment around here. Missionaries came through several years back and we've all but converted."

He left the bar and began aimlessly wandering around the island. As night fell he decided to climb one last hill before heading back to the ship. As he reached the crest of the hill, he noticed a shack all alone with a sign reading:

"Singing blowjobs: $5"

Excitedly he knocks on the door. The door opens and a little old lady looks up at him. He recoils a little and thinks to himself that maybe this wasn't such a good idea. The old lady grins and asks

"Ooooh. Here for the singing blowjob are we?".

'N-no. I have the wrong place, sorry' he stammers.

"Ooooh no, you'll be wanting the blowjob. Come on in. Come on", she says.

He hands her the $5 and enters the shack. The door closes to veritable darkness and he unzips his fly. The singing begins and the lady goes to work to a resounding crescendo. Baffled by how such a thing is possible he asks

'How were you able to do that?!'

"Old family secret" she laughs, half speaking to herself.

Relieved but curious, he leaves and returns the next evening. He knocks on the door and the old woman answers

"Back again are we? I expect you'll be after the singing blowjob!" she enquires.

'Yes, yes. Here is the $5' he says, handing the money over and closing the door behind him. The singing begins and an amazing blowjob follows. He enquires again how such a thing is possible, only to be met with the same reply.

The next day the ship leaves port and they sail out on their next mission. He tells all his friends of the singing blowjob, to which most of them laugh and mock him. He remains adamant it was real and that he'd find out the secret.

Years pass and they chance upon the same island again. The ship docks and he runs to the hilltop to find the shack standing there, with the same sign.

He knocks on the door and the old woman answers again. She looks up at him, and then realisation lights up in her eyes

"Ooooh! I remember you. You'll be wanting the singing blowjob! Come in, come in!", she says.

'No, I just want to know how you do it!' he demands.

"Family secret, can't tell. Can't tell" she replies, smiling and laughing to herself.

'Alright, alright. Here is your money' he says, determined to uncover the truth. He hands her the money and heads inside the dark shack. The singing begins and he tries to focus on his surroundings, looking for a radio or television -- anything which might produce the sound. Before long he is lost in the ecstasy and forgets all about looking. The woman finishes the job, and he leaves.

Frustrated and adamant to uncover the truth, he decides to bring a torch with him the following evening to finally get to the bottom of the family secret.

The following evening he rushes up the hill with a torch in his back pocket. Knocking on the door, he is received by the old woman again

"Back again are we? The singing blowjob it will be?" she grins.

'Fine. Yes. Here is your money' he says, pushing the money at her and closing the door behind him. The singing begins and the woman goes to work. For a moment he nearly loses himself to the feeling and forgets to look around.

Regaining his senses, he fumbles in his back pocket and pulls the torch out. Flicking it on, he casts it down to the table in front of him and the first thing he sees - a glass eyeball.