Replacing Grandpa

My Grandpa died of the coronavirus in 2020, I moved to with grandma Alice 60 in early 2021. I was starting a job at the power plant. I Hamish 24 and being new to the area with Alice and Alice is a quiet slim woman who lived alone until I moved. My mother always said Alice is very quiet as her father was very loud. Meaning he was a loudmouth, I always got on with Alice. I was happy living with Alice I got meals cooked and washing done, I do date, but as I was new it would take time to get my bearings as they say. As a young man I get urges and masturbate to ease them, on weekend I was off duty and was taking care of an urge. When Alice walked in with my clean laundry catching cock in hand, she put my laundry down and left. Thinking I might have shocked I went to say sorry, she said it was okay and she even done it now and then. I hadn't thought her playing herself and thought her passed all that at her age. Seeing the shock look on my face, she I'm human too you know. Being a lifelong smartass, I couldn't help myself and said next time can I watch. Expecting her to be shocked, she wasn't and living all that time with grandpa must have made her immune to wise cracks. But it was her who shocked me, when she said she had got aroused by seeing doing it and if I want I could watch get off as I got off. Not willing to seen to backdown I agreed, we went to her room as it had the bigger bed. She calming undressed fully in front of me and I sheepishly followed her lead. She laid on her bed and started to play with herself, I got an instant hard-on and decide to at least ask. Awkwardly I asked seeing we're both horny, how about us fucking instead of playing with ourselves. She looked at me and nodded her head and I started to kiss her and under her direction worked my way down her body. After she said she was ready I fucked her for the first time. I really enjoy the sex with Alice and asked about us doing it again sometime. She looked at me and said anytime you want, as now we've done it there's no reason not to continue. I've been sleeping fucking her ever since. I've also gotten a girlfriend Wendy 23 have started fucking her and having learnt a great deal from Alice, Wendy is getting well serviced you could say.