Collecting the donations at the sperm bank took a special kind of woman. Kari was glad she was able to put her tight asshole to use by letting men slam their cocks up her ass until they were ready to cum into the cup. She knew that each mind shattering thrust up her tiny back door was a service to couples and women everywhere who wanted to have kids. She was happy she could do her part and be used like the slut she was at the same time. She loved her job.