<human>: So, last week I hooked up with a friend of a friend (I'm a recent addition to their circle, I recently moved in with an old friend, and she is part of his selection of new friends). It wasn't just a sexual hookup though, romance was implied, and we've text everyday since then.

She is planning on coming over this weekend, as we're having a pre-Christmas Dinner before everyone heads away to their parents houses etc. It has already been arranged that she'll be sleeping in my bed over the weekend, and she's even coming a day earlier than the others to see me. 

On Saturday night we plan on drinking, and whenever we drink we end up playing Truth or Dare. That's how I actually came about kissing this girl the first time, so I've just got something on my mind now. If we end up playing again, If she is dared to kiss someone else, how am I allowed to react? I know it probably won't  happen, as my friends are aware of the situation, but if it does, I just want to be prepared and not overreact on the spot. I'd be the type of guy who'd be extremely unhappy if she did, and would find it a complete turn-off...is this unreasonable? And yeah, I know I'm probably over thinking it.

Summarize the given text in a few sentences.
<bot>: Dating (somewhat) a girl, might be playing truth or dare, is it unreasonable for me to be unhappy if she kisses another guy?