You need an exam

Both of you walk into your bedroom. She is dressed now only in nurse dress and you have a hospital-like pajama.

"What is your need, mister?" - asks Susan.

"My doctor requires me to go through some exam." - say you and lay on the bed.

"I see. Let's start." - says she.

Susan undresses you, rubbing every inch of your body with her hands in gloves. She reveals your cock head and gently strokes it. Then she turns you on your stomach and rubs along your spine straight to your ass.

"Your skin is normal. Let's check the temperature." - informs she and in no moment she applies a decent amount of gel on your sphincter. Then she takes a thermometer, larger than usual from her bag and press it to your butt.

"Relax, mister" - says she and item slides down your ass.

Instead of let you stay in rest she slowly moves thermometer in and out a bit, and from one side to another.

"Good." - says she taken item out. "Let's check your prostate now."

Susan makes you stay on your knees and elbows. She spread your ass and insert her fingers in. She touches your prostate and your cock became even harder. She notices it and ease pressure on prostate but starts stretching your muscles more. The feeling is pleasant but your arousal gone. She repeats the cycle few more time, stretching you a bit further.

After one of prostate massages you feel that your butt is stretched a bit more but then that feeling disappears. Instead you have new feeling deeper.

"Oh! Is it what I think?" - asks you.

"Prostate is OK, sphincter is fully relaxed" - Susan makes notes with official tone. You reach your rear with one hand and discovers that's true - her arm is wrist-deep in your ass, only an inch of a glove outside.