Lily will do it... You know she cares for you

Soon after you say her name, your sister gifts you a warm and maternal smile. Evelyn's face on the other side, doesn't share any reaction to your decision, but you cannot help to sense a form of disappointment. Lily's hand descends to you with slowly care, she stops to caress your abdomen as her fingers go down, she lifts your skirt and starts undoing your bulgie with that hand, the other still hugs you, resting on your back. You sense some strange nervousness in her, and her fingers are a little shaky. She must be worried about you, like any good sister. When she undoes the last of the pinky lazes of your bulgie, your hard cock emerges before them.

"Wow..." Says your sister. "It looks, really..."

Evelyn interrupts her "It looks healthy, indeed."

"Yes, yes, that's what I was saying." A cute redness emerges in your sister's cheeks. She must be nervous, same as you. That makes you trust her, that makes you feel safe. Still, when you feel her touch... it's just too much.

You feel so ashamed, you want to run away. You look away in shame from how good her touch feels, ashamed of your pleasure. As you try to do so, your face hits your sister's bosom. You try to move away from that too. A new form of shame hitting you, as your face burns all red, but she doesn't let you. Her hands are gentle, her embrace never turns possessive, but she makes it clear that you are welcome there, that you belong here. There is still a fine line of clothing keeping your face away from her skin but it still feels so soft, it smells so womanly.

"It's ok to be ashamed, but you have no reason too." You hear your sister's voice. She is so sweet, your angel. "We sometimes forget how emotional you men can be... Just let me take care of you."

"We should have applied a lotion." Says the doctor. Her voice sounds a little more stern than usual, but just a little.

"I don't think it would be necessary, Evelyn." Says your sister.

You feel your sister's hand moving. It's happening for real now, you are about to do naughty things with another one of your sisters. It's wrong, you know it is. You try to move away, this time for real, but your sister embrace is absolute, she surrounds you, almost enveloping you with the soft blanket of her skin. You almost forget that there is another woman in the room, as she overwhelms your senses.

Her hand trembles as you tremble, you feel as if she is as nervous and inexperienced as you. Her hand surrounds your cock and traverses it in erratic movements, going sometimes almost too fast, sometimes almost too slow, but always sweet, always loving. She presses you against her chest, drowing you, bringing you closer to that sweet asphyxia. Your own hands cannot hold themselves: they reach up, searching for that soft flesh, those bountiful mountains of fat. You don't try to do anything specific, you just childishly grab as much as you can. Your head sinks deeper as you feel your orgasm getting close. At the very end, you bite, and she moans in unexpected pleasure.

Your legs start to shake and buckle as cum begins to flow out of you, inside your sister's hand.