Sperm Bank Asshole Worship/joi

overall theme is asshole worship/joi with cum countdown. premise is that I am your nurse at a sperm bank and you am having trouble donating sperm. i don’t normally do this but i can try to personally help you out. bit of flexing and teasing a bit. you flash my boobs to see if it does anything to help, but not really. i then notice that you get more aroused every time i turn around, so you realize that i’m fascinated by your ass. i take off the dress and spread your ass. i gently rub the rim of my asshole. I begin a cum countdown from 10 i wink my butthole on each count. can you last