Nurse helps me at the sperm bank

So I went down to my local sperm bank a couple of days ago and I wanted to make a donation. Maybe some couple out there that is having a hard time conceiving could use it. When I got there they had this HOT nurse Aria. She gave me the run down, told me to basically cum in the cup. But when the pressure was on I couldn't do it! i tried looking at porn but I really couldn't get hard. Luckily this chick was dedicated to her job. She fucking sucked every drop of cum out of my big dick! I think the key was how she stimulated my balls, thats were all the cum is produced right? Who knows. All I know is she did he MF thing on this one!