I hide cash in my best friends house and have been for two years

This all started my I meet my bestfriend lets call her E in 2024. E's family aren't the most fortunate family in the aspects of money I've known this since I meet them. I first met E through a mutual friend and me and her clicked instantly we spent the whole summer we first met together going on 'adventures' having sleepovers and we also went camping. I love E she is my world and she really saved me when I was at my lowest as I like to think I did for her. Her family took me in when I had issues at home and have always offered me a place to stay. I usually brought me and E food for lunch and or tea and snacks everytime time i was there and refused to let her pay (also getting her mum chocolates every so often) One day when I was round they didn't have milk and her mum needed it to make something (her mum had always been kind to me and really helped me alot I see her as a mother figure and I have so much love for her) I offered to go buy milk for the shop but she said they couldn't afford it at that time, I said no worries and that I would pay. She was very thankful and I reassured her is was the least I could do considering all that they did and continue to do for me so me and E went to the shop and brought some milk for her, I really had no problem doing this considering I have a job that pays well, I don't buy alot of things apart from monthly hairdye and occasional body jewelry as I have quite a few piercings. we got back with the milk, I made her a cuppa and me and E went into her room to watch TV and chat, as you do. Anyway E ended up telling me that her and her mum do 'money hunts' round the house when they're tight for money, this entails checking under the sofa, checking sofa cushions, the laundry pile etc to find loose change. She laughed and told me some funny stories about these hunts and I laughed along with her. Thats when it began. I started hiding loose change (20ps, 50p, £1/2 coins) around the house and the occasional £5 note. Everytime I came to her house I left around £4 worth in change in spots where I knew they'd look, sometimes putting some in E's money box. They still dont know and I'm never going to tell them. I do this because I love them so much her and her family are so good to me and so kind to me and have genuinely just taken me in over the past two years, her and her parents have gone above and beyond for me and her brothers always kind and treats me as if I'm his sister too. I have kept this secret for 2 whole years and plan to for many many more.