My story has a happy ending but still fits.

There was this girl I was flirting with at my college for a few days. It was family weekend and my parents were visiting. We were busy with events until 10pm when my parents left for their hotel. The girl I was flirting with had been texting me and got me to come over when they left. We had only just met a few days before so I didn't think anything of it. We watched some tv and chatted, then she snuggled up with me. She goes in for a kiss that results in us making out, with some touching. After a few minutes one of her housemates comes out of her room to grab something. She then suggested we take it to her room and I'm like yeah sure, don't want to make out infront of housemates if they are around. Cue us making out for a bit and her slowly getting us both naked, and I still had no idea. Finally she gets up, grabs something from her nightstand, and tosses it to me. I look and it's a condom, that's when I realized what was going on, I lost a card that night!