My girlfriend embarrassed me in front of my dad

First off, I'm not angry at her and I think this is funny.

Me and my girlfriend hadn't done anything sexual yet. Last night, we were watching tv and making out, I got a boner but I told her to ignore It because I know she isn't ready for actual sex yet.

We carried on making out but then I heard my dad so we acted normal and I covered myself with my duvet (I did have to clothes on I just didn't want my dad to see my boner because that'd be embarrassing). My dad was talking to me and my girlfriend started touching my crotch. I laughed and I don't even know why, my dad asked why I was laughing and my girlfriend did even though she knew why.

I just said there was no reason which made me seem weird and my dad just left me alone after that.

My dad probably thinks I'm crazy or something