My [M]20 Girlfriend [F]19 got seen bottomless by our friends [F]18 [M]19 and I think I kinda liked it?

Yesterday we were having kind of a small dinner party for us 4 at my place. I [20M] got ready first and while she [19F] was doing her makeup, I was in the kitchen cooking. When I needed help I called her over. She came in a tank top and seemingly fully ready except for her hair from the waist up, but from the waist down she was bottomless. At that point it didn’t really turn me on because I’m used to her naked and I was busy and distracted with cooking.

A bit later our friend [18F] texted my girlfriend saying that she’s there. Because I had my hands dirty and we were expecting our friends to arrive separately, my girlfriend asked me if I’d mind her opening the door like she was. I was hesitant since the friend had never seen my girlfriend naked before, but I didn’t want to make her wait outside in the rain so I just said okay.