I feel like there is a lot of sexual tension between me (M) and

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I feel like there is a lot of sexual tension between me (M) and our family's lodger. I live with my dad. I'm 18, the lodger is at least over 30 and very attractive.

Conversation between us has always been slightly intense. I've got quite a cheeky, vulgar personality when I'm at home and she's noticed the fact that I work out in the mornings. she caught me in the kitchen with my shirt off today - she didn't seem flustered, but I could tell by the look on her face that she was at least amused. After that the conversation abruptly ended. But then I went into the other room, and she seemed to chase me down the hall to continue to try to talk to me. By this time I'm wondering why she walked from one end of the house to the other to continue talking to me, despite the gap in conversation. Was she literally chasing after me?

there will be many other situations like this, where my dad is gone and it'll be just me and the lodger in the house. The only problem is that she has a boyfriend who visits every so often. To add insult to injury, I'm fucking desperate to get my nut off. I could not handle the boyfriend finding out. but I feel like if the situation arose again, it could happen easily.

to what extent would this be shitting where I eat?