me, my girlfriend, her friend, and her friends boyfriend all decided to fuck in the same room (no swapping planned), at first we started off in a dark bedroom and couldn’t really see each other. my girlfriend’s friend suggested we all take a shower together and when we did there was plenty of light to see eachother and that’s when we all noticed he had a much bigger dick than me. me and him stiff side by side while the girls were on our knees sucking our cocks, i kept seeing my gf glance at his. i told her she could join her friend and suck his if she wanted and she just stared at it for a few seconds before nervously declining to. i think she didn’t want to make me upset, i wish i would’ve told her i wanted to see her suck it