Me and my girlfriend let my younger cousin watch us fuck while drunk

My younger cousin (won’t say actual ages of all of us for reasons but the age gap is 4 years) got drunk with me and my girlfriend one night, was my girlfriends first time drinking and she got really horny, she started sucking me off outside in front of my cousin at one point, when we got back my cousin sat at the top of the bunk bed and we started fucking on the bottom, he gradually worked his way down until he was sitting right next to us then my girlfriend asked if she could have two dicks in her, I told my cousin to get his cock out and shove it in her throat (and he did!) we fucked and she sucked for ages until I creampie her and my cousin ate her out after, that really turned me on and staring at his thick cock woke something up in me, my girlfriend passed out drunk halfway through so we went downstairs him still not being satisfied and I tried sucking his cock, was rubbing his jeans and went to unzip before he said it was a bad idea and it’s probably the alcohol making me do it, I really want to suck his dick, after this happened I met a guy online and got fucked, I loved it and want my cousin to fill me up while my girlfriend watches, any tips or plans on how to do this