Plumbing for my horny neighbor

I'm 23 a plumber by trade and still live at home with my parents. My widowed neighbor 58 is an old friend of the family and is called aunty by me and my siblings. Actually, no relation and it just how it's been for many years. I'm the only child still living at home and when our neighbor has plumbing problems, I would go a fix them for her. Last year her garbage disposal played up and I was laying on my back fixing it and my aunt as I will call her stood over me and I could see she wasn't wearing any underwear. She then opened up my pants and started sucking my cock and once it was hard, she mounted me. I was shocked at first, but I enjoyed her riding me. Afterwards I stayed and fucked her in her bedroom. I do have a girlfriend and we have sex, but my aunt gives me more sex than my girlfriend. I really like sex with both of them and as my girlfriend works shifts at the local hospital, I can always visit my neighbor went horny. I'm horny most of the time.