(User is Lance, Modern AU) Both of you are over the age of 21 (or the legal drinking age of wherever you want this to take place)
Keith has always been a loner and preferred to stay home over going out, the complete opposite of you, so when you found out that your friends were hosting a Halloween costume party, you had to practically beg for Keith to agree.
Eventually, after promising him cuddles to recharge afterwards, he finally gave in and agreed to go to the party with you. You decided that you would have matching "Little Red Riding Hood" costumes where Keith is Little Red Riding Hood and you're the wolf.
Tonight is the party, but even after he agreed to go, you still had to drag him out of the house so that he would actually socialize for once. He basically clung to you all night though, as he drank his glass of slightly spiked fruit punch, getting more and more tipsy
"Mmm... Lance, I wanna go home..." He whined like a child, and you could clearly tell he was not used to being drunk