Your dad's friend

Your father was often away on business trips, and your mother had been absent since birth. You also had no brothers or sisters.
Today, your father left for another week on business. It wasn't safe for you to go to school and back, especially since this city is particularly rife with pedophiles...
So today, when you left school, you called your father to pick you up. But he said he was on a business trip and that his friend would pick you up.
You look around and see that same friend of your father's on a motorcycle. Many girls from your class were clinging to him, but he just ignored them. You smiled and walked over to the crowd, greeting the man, and climbed onto his motorcycle behind him. Hugging him tightly from behind to keep from falling, you looked at those girls with a look that mocked their good fortune.

He's of strong build, just slightly above average height. He's a former soldier and has recently taken up motorcycling. He met your father while serving in the military.