... Breasts?

Susan giggles at your uncertain sounding answer. "You're probably used to hearing that a sperm sample is traditionally collected using one's own hand and either a magazine or an appropriately stimulating video. But I've learned you get a better sample size and higher quality if outside stimulation is applied. But using any of my holes would result in excessive fluid contamination. So... hand or breasts?"

After the initial surprise wears off (again) you manage to say, "I... think I already made my choice."

Susan winks at you, licking her lips as she replies, "Then a boob job it is."

She reaches down, beginning to undo the other buttons of her top, exposing the black lace bra beneath it that strains to hold back her full mounds. At the same time, your hands go to your belt, unbuckling it before you unbutton you pants and stand up just long enough to let your pants and underwear slide down to your ankles. Your manhood hangs at half mast, still not fully recovered but certainly responding to the sight before you.

"Now remember," Susan says, her voice dropping to a whisper as she undoes her bra, placing it and her shirt on the bedside chair, "We may be alone now but other beds may come in use so do try to keep your voice down if you can."

You nod, only half listening as you stare at her large, full tits. They are at least D-cup sized, with only the slightest bit of sag as a result of age and gravity. Her nipples are pale colored, almost white, causing them to contrast against her tanned skin. They are already stiff, leaving you to wonder if it is because of the temperature of the room or if perhaps she is a little excited about this as well.

Susan reaches for the unmarked bottle, undoing the cork and pouring some of the clear liquid into her free hand. "A little something for lubrication," she says as she notices your curious glance, "As well as to help you get a bit of your... vigor back given your previous activity."

She brings her slick hand down to your manhood, wrapping her fingers around its girth, stroking slowly up and down to spread the surprisingly warm liquid over it. Her hand is soft and warm as well and you let out a soft sigh at the contact. After a few strokes, her hand slides down to briefly fondle your balls, spreading the fluid over your sack as well. "My," she says, "A good healthy size. I'm going to get quite a good sample from this."

Susan pulls her hand away, her forefinger tracing the underside of your dick one more time before she pours out more of the fluid and begins to rub it into her cleavage, preparing to take your cock between it. As she does so, you suddenly feel a heavy tingling in your balls and you have to stifle down a groan as they start to swell slightly, feeling as if they've grown in size and weight from the heavy amount of cum generating inside them.

"If you're feeling a little tight down there, sweetie," Susan says as she drops to her knees between your parted legs, "That's normal. It's the Invigoration Balm doing its work. Just let me know if it starts getting outright painful instead of mildly uncomfortable, okay?"

You nod in reply but any words you could think to add are driven from your mind as Susan brings her hands to her breasts and presses them together, your now extra sensitive rod being swallowed up between them. The smooth softness of her tits around your manhood is certainly a new sensation for you and is also most certainly not an unpleasant one as Susan tightens and lessens her squeezing, milking you with her boobs. "My my my," she whispers so softly you can almost barely hear her, "You ARE a big boy, aren't you?"

A grunt between gritted teeth is all you can manage as a reply as your hips begin to move in time with her rubbing and squeezing, the movement made easier from the lubrication provided. The head of your cock occasionally bumps up against her chin with each upward thrust and you can't help but notice her eyes flicker down to it occasionally with a look that seems to contain a glint of more than scientific curiosity.

For the next minute, neither of you say anything save for the occasional suppressed sigh or stifled moan as the growing tingling sensation in your member gets more and more intense. You grip the bed sheets tightly, air hissing in and out of your lungs as the movement of your hips starts to grow slightly erratic and you can feel your end approaching. You clench your lower muscles as tightly as you can, wanting to hold on and enjoy this sensation for as long as possible but Susan either sees something in your body language or senses something in your aura and redoubles her efforts, wet squishing noises filling the air as she rubs her tits around your cock more and more intently.

You internally debate saying something in warning or just surprising Susan with your release but again, she seems keenly aware of your condition and suddenly pulls her breasts away, grabbing the sample cup and holding it up to your member as her fingers wrap around your rod once more and begin to stroke. In your condition, her first hand motion is enough to set you off and you are just barely able to hold in your cry of release as cum begins spewing out of your cock-head at an intense rate.

In fact, it is quite a large amount of seed, your eyes widening as each stroke of Susan's hand seems to milk more and more of your baby batter out of you. Perhaps it is the result of having used the Invigorating Balm is something you would have considered if spots were not appearing before your eyes from the seemingly endless pleasure of release you are feeling. Eventually though, your member spurts one final time and, after a few more strokes to make sure she has gotten the last of your cream, Susan lets go of your manhood to cap the now utterly full specimen cup.

She seems surprised as well at the amount you have shot out, smiling at you as you flop back onto the bed, gasping for breath. "That's quite the **** reaction," she says as she places the sealed cup back into her bag, "I wonder if it means you respond well to Tantric Healing or if you have an extra sensitivity to potions. Either might also be connected to what's causing your unusual magical situation as well."

Susan stands up again, stretching her arms over her head and arching her back slightly. The motion makes her wonderful tits sway enticingly and you are suddenly aware that your manhood is quickly regaining its hardness. If she notices your condition, Susan does not respond to it, so perhaps this is normal. However, you are feeling incredibly horny, distractingly so, and you are pretty sure you cannot return to class like this.

You consider telling Susan this, but you are not quite sure what that would do. Maybe she would help you out in another way? Or maybe you have read her wrong and this was all as business-like as she'd initially proposed, meaning she'd probably tell you to "help yourself" at this point. Of course, you could also track down Amelia and see how serious her offer to you is now that you really could use someone to... well... use.

"Now just take the time you need to recover," Susan says, arms behind her back as she observes you, not yet having put her bra and shirt back on, "unless you're still feeling strange, then please let me know."