Evelyn will do it... She is a profesional, right?

Soon after you say her name, you see a strange light crossing the background of your sister's eyes. It is there for just a moment, and then fades quickly like it never existed. Lily is still by your side, her arms still embrace you protectively as Evelyn lifts your skirt and starts undoing your bulgie with care. The doctor's face and movements remains at all times profesional, her movements are precise and premeditated. When she undoes the last of your pinky lazes of your bulgie, your hard cock emerges before them and both women fall to silence.

"Alright" Says the doctor. "So far it looks healthy... Do you take some special care with it? Some lotion or perfume?"

"Why would...?"

"I ask for medical reasons." Says Evelyn with a quick remark. "You see, some boys can present some allergic reactions to certain products. Have you suffer previously any such conditions?"

"I think n-not..." You mumble.

"Good. I will apply now a lotion to facilitate the experience for you." She produces from her briefcase an elongated pink tube. It looks like toothpaste, but you instinctively know it isn't. You don't get to read the name of the product, only the phrase 'The Best for Him' written in it's surface next to the smiling face of a cute and shy manly man. She applies a generous amount between her hands and then she starts to scrub it all over your penis.

You feel so ashamed that you want to run. You look away in shame from the beautiful woman stroking you, ashamed of your sudden feelings for her, of how much her beauty strikes you. As you try to do so, your face hits your sister's bosom. When has she got so close? 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. 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 stay there and let the doctor work."

You feel Evelyn hands moving. The lotion feels almost cold at first but it soon start to turn hotter. It starts to burn and your dick grows insanely hard in a couple of seconds, it even start to hurt a little. "It burns!" You cry, scared by this new feeling. You try to move away, this time for real, but the stern doctor's hands keeps your lower half in place. Your sister is much more nicer with your upper half... but she still doesn't let you to get away.

"It's a completely normal reaction." Says Evelyn. She smiles to you as your left eye looks at her. The right one is still submerged in your sister's bosom. alongside that part of your face. Your eyes focus into each other's and she seems to stroke you a bit faster, a bit harder, now that you look at her. Her fingers surround your cock with efficiency, leaving no centimetre of skin untreated, she makes sure to traverse every part of your surface, to maximise your pleasure, her other hand doesn't forget of your scrotum. There is something mesmerising about how clinical and efficient she is. Her hand rotates just in the right angle as she goes up and down. Her thumb does a playful dance over your meatus, rubbing it gently, it caresses your head in coordination with her index finger. The middle finger crosses just under your glans, hugging its surface. Each finger seems to move independently, in a perfect choreography, the master plan of a devious and methodical mastermind. Her other hands ascends then as she extends her index finger and presses it gently over your exposed frenulum. She makes you moan as your sister presses your head against her flesh, making you sink deeper into her bosom.

Just them, as you keep focusing on the eyes of the beautiful Evelyn, something strange crosses her serious facade: her lips curve in an strange way, almost like she was sending you a kiss, like there is love and kindness hidden under that serious facade, a deep secret that she will reveal only to her true man. The smile is so brief that is almost no existent, but somehow it reaches you, somehow you know that this is not only a medical purpose for her.

Your legs start to shake and buckle as cum begins to flow out of you, into the kind doctor's hands.