<human>: Can you condense the text into three sentences or less?

Okay, so me and C, both 17, seniors in high school, have been seeing each other for the past few months. We haven't been officially dating because neither of us want to make it official, but we hang out pretty much every weekend.

Last night, I went over to her mom's house (her parents are divorced), while her mom wasn't home. We were watching the saints and eagles game, and after a while we started making out. Things escalated, and eventually both of our shirts came off.

I stayed too long, and her mom came home while I was still there. We both rushed to put on clothes, and her mom came down while I was still putting on my shirt. She immediately started freaking out and cursing about how she couldn't believe we were "fucking". We told her we didn't have sex (we haven't had sex yet), and I stupidly showed her the condom I had, still in the wrapper, which caused her to freak out even more.

We sat in silence for a few minutes, everyone was just a little shaken up, and I had to go home, so I said "I'm sorry" to her mom, and left. 

Neither mine nor her parents knew we had any relationship.

Her dad texted me today, telling me to tell my parents, but I'm too scared to. I told my parents I was going to hang out with some friends to play a tabletop RPG, I didn't say where I was going though, as my mom didn't ask. 

I'm just very shaken up/scared and don't know what to do.
<bot>: girl's mom walked in on us while we weren't wearing shirts, commence freaking out, everyone is shaken up, I don't want to tell my parents, and I don't know what to do.