Gf’s little sister sucked me off

I was dating a college student, and her family invited me to her house out of state for Thanksgiving. Her dad didn’t want to let us sleep in the same room, so my gf went to her bedroom, I got the little sister’s bed, and lil sis got sent to the couch.

At some point during the night I was woken up by somebody rubbing my cock thru my shorts. I wasn’t overly shocked that my gf would sneak in to play around, we were very sexually active, horny people. When I started to get hard, she pulled it out of my shorts and started to suck me off. It was a nice wet passionate blowjob, and it didn’t take too long before she was swallowing every drop of my cum. She pulled my shorts back over my cock, gave it a little pat, and walked out of the room.

Next morning at breakfast, dad was cooking, little sister was at the table. My gf and her mom were still in bed. Dad asked me how I slept, and I told him good. When my gf walked into the room a couple minutes later he also asked her how she slept. She said great, she didn’t even wake up once during the night. I smiled at her and gave her a little look. She looked confused lol. Which made me confused. Little sis kinda laughed at something so I looked over her way and she was giving me the same knowing look that I had just given my gf. My eyes went wide when I realized what was going on. She just smiled.

—-> so whenever I’ve shared this story, people always ask me if the little sister was better or my girlfriend. And honestly it was a surprise blowjob in the middle of the night, so I don’t really even remember how good or bad it was lol. I just remember getting my dick sucked, and my load swallowed. But for the record, that girlfriend was average at best at sucking dick. She was very willing, and she did it often, and she got very into though, so it made her good!