I think I (M/26) may have turned my neighbor (F/19) into a good girl [MF]

Some context first: I live in a small-ish house with 2 apartments. Used to live downstairs alone for the longest time. For financial reasons decided it’s best to rent out the upstairs apartment. Earlier this year I rented it out to this girl called Emma. At the time I was still with my now ex-girlfriend. I didn’t have much to do with Emma, except for the occasional neighborly small talk when you randomly stumble upon each other. Emma is 19, just started going to university and is very introverted. She’s not a supermodel, but she’s cute. She’s skinny I’d say, she’s tiny, has brown, shoulder length hair, the kind of tits you can perfectly fit into one hand and a really great ass in my opinion.

I’ve never much noticed she’s there, she’s always been kinda invisible to me. A while ago I broke up with my ex-girlfriend. Emma has been surprisingly chatty since and we’ve been talking a lot. One Saturday afternoon we’ve been texting all day and eventually we started sexting. I thought “fuck it” and just went upstairs, wanting to see what happens. We hooked up and got to talk afterwards, turned out she has had a crush on me since forever. She said she could hear me and my ex have sex all the time and it would always make her horny, it was super frustrating for her because she doesn’t have anyone. This turned into a regular thing and we’ve hooked up a lot since then.