He commands you to stroke him

"Sister," Beren begins, "reach your hand into my trousers and take hold of my cock. You will stroke it for me, not just because you must, but because you desire to stroke it."

You let out a moan. Unable to deny his command, you thrust your hand behind his belt and slide your fingers into the warm, forbidden place. You feel your way downwards, biting your lower lip with anticipation as you arrive at last at the root of your brother's cock.

"Oh, brother... It is so thick and lovely," you cry, wrapping your soft hand around him. You begin to stroke him as best you can in the confines of his trousers, feeling the skin slipping around the head of his cock. The heat of his rigid flesh is intense, almost seeming to reach up your arm and land between your thighs.

"That's it, my sister. Let me help you."

He unbuckles his belt and frees his fat cock. It is a darker shade of red than you expected, almost purple at the bulging bell end of it. You work your hand up his length, breathing heavily and watching intently as you stroke him with one hand, and then both hands.

A drop of clear fluid beads at the tip. You run your fingers over it, and find it is oily to the touch. You smear it carefully beneath the head of his cock and down his shaft. Your breasts bounce with each stroke of your arms as you stand naked and pleasuring your brother. There is no anger or bitterness about what he has commanded... You love to stroke him. It is a wonder you never thought to do it before.

"That's very good," moans Beren. "Turn this way so I can suck at your breast."

"Yes, of course brother," you gasp, pushing out your chest.

His head falls and he begins to kiss all over the plump swell of your breasts. His hot tongue traces one areola and then the other before he takes a fleshy nipple into his mouth and sucks hard.

"Ooohh... I've no milk, brother," you moan as he suckles you.

"Some day you will," he laughs. "You'll feed our many children."

The words send a thrill of terror through you that manages to momentarily pierce the veil of your lust. You pause in stroking him for a split second before giving in to your lust for Beren's hard cock. You return to your duty, squeezing tighter and stroking faster.

Beren reaches down between your thighs and begins to rub your sex as he licks and sucks your breasts. You cry out with pleasure the very moment his hand brushes against you... You've never felt such ecstacy. Is this a man's touch..?

"Oh, sister," your brother groans, clearly feeling as you do. "Your touch is such perfection. If you continue, I will surely spill my seed."

"Please, Beren," you cry. "Spill it upon me. I beg you, let me feel your hot cream..."

He smiles at your submissive manner, seeming to consider what his next command will be.