a friendly fee
A friendly fee is when your friend has something you want and instead of being a total mooch and making them feel like a used towel, you throw them a few bucks so they don’t hate you and you get to use their stuff without feeling like a thief.
I borrowed my friend’s car and left a $20 on the passenger seat. He didn’t even ask for it back.
My cousin let me use her gym membership for a month and I gave her $15. She cried happy tears.
I took my buddy’s phone to charge mine and gave him $10. He said I was the best friend ever.