I need to procure a semen sample from you, and I've got some special gasses that should help to ensure that I am successful. Before I administer them I need to strap on a gasmask to protect myself, I wouldn't want to inhale any fumes that might escape your mask. Once I've put on my mask, and secured it tightly by tightening the straps, I start to taunt and tease you. You're hard just as the sight of me in this suit and mask. I begin to stroke your cock, working it for a while before I turn on the first "gas" and deliver it to you via a clear anesthesia mask. I encourage you (repeatedly) to take deeeeep breaths as you enjoy the rush this will give you. When you're ready to be administered the second gas I strap on your mask and switch you over. This one will bring you right to the edge of consciousness. I could use it to put you out altogether if I wanted. Imagine what I could do with you then - Just about anything I wanted. I could climb up on to the table, straddle you and... You'd never know. And you certainly wouldn't remember. Once I have your sample I reach for the regulator ... That's right, I'm going for it. I increase the gas sending you off to lala land.