My horny grandmother's maid

A few weeks ago, a young maid arrived to look after my grandmother. As the days went by, she grew increasingly affectionate toward me, eventually to the point of trying to seduce me. I’ve also been visiting my grandmother daily to keep her company and make sure everything is okay. One day, the maid asked me in a flirtatious tone if I was a virgin; the question caught me off guard, so I quietly answered "yes." I found the question quite strange, given that she looks to be about 39 and I’ve just turned 20. Ultimately, that flirtatious attitude made me nervous whenever I saw her nearby in the house. The turning point came when those boundaries were crossed: she was washing dishes and I was standing right behind her, looking at the fridge. She intentionally bent over and pressed her ass against me in a very provocative way—and personally, I got incredibly aroused. I’m quite shy, so I turned away and stepped back; I told her I had something urgent to do, then quickly grabbed my things and left for home. The thing is, I’m a pretty horny guy and had been looking for a fling—or something similar—with a girl I might meet at university. Instead, I’ve got this horny maid constantly flirting with me. Now I don't know whether to play along and let things happen or keep my distance. Her intentions don't seem bad, but the age gap leaves me stunned—even though I do want to try new experiences.