Family Ties/I'm feeling a little..ehh
You reply "Well nurse I've been having the weird feeling..., You know, down here..." Timidly you point towards your now hard cock that is tenting your shorts. "Maybe you should check it out?"
Jessie looks a little shy but begins to unzip your pants pulling them down, and then pulls down your NASCAR themed boxers to allow your hard, rather large cock to stand at attention right in front of your twin sister. She leans down and begins to visually inspect your dick making it throb under her gaze. It's not helping matters that you can feel her warm breath against it when she breaths.
"Very interesting..." She whispers, still scrutinizing your cock. "When do you notice this happening sir?"
You squirm a little on the bed, wondering just how far to push it. Considering the fact that you are naked from the waist down you see no harm in getting a little bold. "Well you see doc, my twin sister is really really cute and when ever I'm around her I can't help but start thinking about her being my girlfriend. And every time I do this happens." You tell her, once again indicating to your throbbing cock.
Jessie is blushing fiercely after listening your 'explanation of your condition' but to her credit she's able to maintain her character. "Do you mind if I examine it sir? I may have to touch it, is that OK?"
Do you say: