Was getting on bus today to go shopping.Went upstairs behind a young girl of about 18-20.she was wearing short skirt,seen right up it.Was wearing silk white thong.Nice ass.She knew I was looking.She sat in front of the bus and I was behind her.She turned round and smiled.She parted her legs and saw her knickers reflected on bus window.All the time I was on the bus she kept her legs open.